As promised, I've made a video tutorial on how to do the group assignment, both excel and how to write your report.

I've also attached hereby a detailed instruction on how to write your report. Read the pdf file carefully and answer the specific question in there and the numbers/outputs you get from Excel. Sample Report or Sample Report

A sample file of Excel is also attached hereby

Sample Excel file or Sample Excel file

I've got some problems uploading to Youtube, I hope Google to work it out before tomorrow. In the meantime, you can download the video tutorial from here (Right Click —> Save link/target as)

Video tutorial

So, what I suggest you to do is:

1. Start with looking at the pdf file. That's what your report is expected to look like. The basic structure is the same. Just add your comments, graphs, and numbers of your own. Remember, you comments and decisions are the most important in deciding your mark!!!

2. If you don't know how to do something in Excel, look at the video tutorials. If you still cannot do it, you can open the excel file to see the formula or something.

If you are still stuck, feel free to email me. I'll reply ASAP.

Good luck with your assignment.

Vinh Tran

Update: I've just managed to get the videos live on Youtube, you can view them here, divided into 3 parts due to the Google's stupid 10 minute limits.

Forum category: GROUP ASSIGNMENT RESOURCES / Video tutorials

Forum thread: Video tutorials and detailed instruction ]]>

Quiiz for Tutorial 8 on Hypothesis Testing for 1 population is now available.

or

Click here

Forum category: TUTORIAL STUFF / Tutorial 8 - Hypothesis Testing for 1 population

Forum thread: Tutorial 8 - Quiz ]]>

To test your knowledge on Sampling and Sampling distributions, try this quiz:

or

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 6 - Sampling Distributions

Forum thread: Sampling Distribution - Quiz ]]>

As you will be facing the same questions in the final exam, it's important that you know how to do the exercises you did not do well in quiz 2. Try this quiz after reviewing your exercise.

To do the quiz,

or

Vinh Tran

Forum category: Hidden / REVISION

Forum thread: Continuous Distribution - Quiz ]]>

As you will be facing the same questions in the final exam, it's important that you know how to do the exercises you did not do well in quiz 2. Try this quiz after reviewing your exercise.

To do the quiz,

or

Vinh Tran

Forum category: ANNOUNCEMENTS / Quiz 2 Remedial

Forum thread: Continuous Distribution - Quiz ]]>

As you will be facing the same questions in the final exam, it's important that you know how to do the exercises you did not do well in quiz 2. Try this quiz after reviewing your exercise.

To do the quiz,

or

Vinh Tran

Forum category: ANNOUNCEMENTS / Quiz 2 Remedial

Forum thread: Discrete Distribution - Quiz ]]>

In an effort to help you study, review and assess your progress, I've made up the quiz below for you to try. Try to do the quiz without any help/assistance from any material. It will tell you your results and you can review to know which questions you went wrong (if any). If you can pass the quiz, you should be ok. Otherwise, review and practice more.

Try it as many times as you like, not to remember the answer, of course!, but to give you more practice and confidence.

To do the quiz,

or

I will try to make one quiz for each tutorial. So, watch out for new quiz to come and make the most out of the quizzes for assist you study!

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 7 - Confidence Interval

Forum thread: Tutorial 7 - Quiz ]]>

Please be informed that you don't have to do any exercise before coming to next tutorial.

Regards,

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 7 - Confidence Interval

Forum thread: Tutorial 7 - Preparation ]]>

Hope that you've had a great mini-holiday and get some refreshments to fight to the rest of the semester.

Next week, as you know, we will have our second quiz. Therefore, I just ask you to do 2 exercises BEFORE coming to class next week, which are ** 7.6** and

See you in class next week!

Regards,

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 6 - Sampling Distributions

Forum thread: Tutorial 6 Preparation ]]>

Please be gently reminded that you will be having your first quiz in the tutorial right after the break on Wednesday, August 5, 2009.

The quiz will contribute 10% to your final grade. Details of the quiz are:

* Duration: 30 minutes

* All material are accepted.

* Remember to bring your calculator.

* Covers: Probability, Discrete Distributions and Continuous Distributions.

The summary Here will help you revise for your quiz 2.

Please note that we still have our tutorial AFTER the quiz.

Good luck for your first quiz.

Vinh Tran

Forum category: ANNOUNCEMENTS / Noticeboard

Forum thread: Quiz 2 (10%) - Week 7 - August 5, 2009 ]]>

If you have completed "filling in the gaps" in the solution I handed out in class, the full solution is available here for your further checking. Click Here to download the file.

Best Regards,

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 5 - Continuous Distributions

Forum thread: Tutorial 5 - Continuous Distributions - Full Solution ]]>

The exercises you need to complete BEFORE coming to class next week are: ** 6.1; 6.6; 6.7** and

See you in class next week!

Regards,

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 5 - Continuous Distributions

Forum thread: Tutorial 5 Preparation ]]>

The exercises you need to complete BEFORE coming to class next week are: * 5.2; 5.5; 5.7* and

Please be noted that all these 4 exercises will appear in your quiz and final exam.

See you in class next week!

Regards,

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 4 - Discrete Distributions

Forum thread: Tutorial 4 Preparation ]]>

Please be gently reminded that you will be having your first quiz in the next tutorial on Wednesday, July 8, 2009.

The quiz will contribute 10% to your final grade. Details of the quiz are:

- Duration: 30 minutes
- All material are accepted.
- Remember to bring your calculator.

Please note that we still have our tutorial AFTER the quiz.

Good luck for your first quiz.

Vinh Tran

Forum category: ANNOUNCEMENTS / Noticeboard

Forum thread: Quiz 1 (10%) - Week 4 - July 8, 2009 ]]>

As we will be having the first quiz next tutorial, I would let you guys go very easy on the preparation for the next tutorial. In fact, out of the numerous exercises in your tutorial notes, I just require you to do 2 exercises before coming to the next tutorial: * 4.17 and 4.26*.

See you all in class next week!

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 3 - Probability

Forum thread: Tutorial 3 Preparation ]]>

As I said in the first tutorial, out of the many homework exercises in the tutorial notes (the orange one), I will require you to do some of them, which will be discussed in the tutorial. Remember that, after the tutorial, when you receive more material to study, you still need to do the rest to practice for your own benefit!

For tutorial 2 next week, the exercises that you need to complete before coming to the tutorial is: 3.3; 3.6; 3.26; 3.23 and 3.25. Just 5 out of the total 16 exercises. So, I expect that you will be well-prepared for the tutorial.

See you in class!

Vinh Tran

Forum category: TUTORIAL STUFF / Tutorial 2 - Descriptive Statistics

Forum thread: Tutorial 2 Preparation ]]>

You got it. Just a minor correction. Second pick: $P(R2|R1)=\dfrac{3}{8}$ ;)

Don't worry. Worrying too much will make you panic. The kind of questions will be similar to those in the quizzes.

You're well-prepared. Believe in yourself!

Best of luck!

Forum category: Hidden / REVISION

Forum thread: Hlp me in this question ]]>

For P(red and red)

First pick P(red1) = 4/9

Second pick P(red2) = 3/8

and then just multiply them = 4/9 * 3/8 = 12/72

ser im really2 affraid for tommorow

huh.. it seems that i dont have any describe of how the exam situation?

how the question will be outcome….

and all about that … huh

this my first exam in australia and my exam using english question….

Forum category: Hidden / REVISION

Forum thread: Hlp me in this question ]]>

This is exactly the same as exercise 4.17 that we discussed in class.

Here we are having 2 picks.

**1.** $P(Red \cap Blue)=?$

- First pick:

Since we have 4 red marbles out of the total of 9 marbles, the probability that we will get a red marble in the first pick is:

$P(Red)=\dfrac{4}{9}$

- Second pick:

This is without replacement (pick out and don't put back, which means in the second pick, we will have a total of 8 marbles left). We don't know if the first pick is red or blue (which means that we don't know how many red and blue marbles are left in the second pick), we need to assume that the first pick is red.

If the first pick is red, we will know that 3 red and 5 blue marbles left for the second pick. Therefore, the probability that we will get a blue marble in the second pick is:

$P(Blue|Red)=\dfrac{5}{8}$

- Conditionally probability formula:

$P(Blue|Red)=\dfrac{P(Blue\cap Red)}{P(Red)}$

Therefore,

$P(Blue\cap Red)=P(Blue|Red)\timesP(Red)= \dfrac{4}{9}\times\dfrac{5}{8}=\dfrac{20}{72}=0.27778$

**2.** $P(Red\cap Red)=?$

Using the same reasoning as above, try it yourself and post your answer here :)

Forum category: Hidden / REVISION

Forum thread: Hlp me in this question ]]>

Find the probability of the event “The first marble is red and the second is blue.”

Find the probability "both of the marble is red"

I cant answer it ser, help me

Forum category: Hidden / REVISION

Forum thread: Hlp me in this question ]]>

You're having symptoms of overstudying and worrying ;)

"At least 2" means that "larger or equal 2" ;)

You mark is at least 70 means that you have 70 or larger marks ;)

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

i thought there some mistaken in the solution that you give..for the table (x-mu)

n why in the question b say that at least 2 that means less than or equal two

but you make it more than or equal two..

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

If you do not reject $H_0$, then "There is no evidence to support the $\text{alternative hypothesis}$"

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

one more question from me

if the Ho is reject

so is it always that the manegerial decision is also say 'there is EVIDENCE'

and if the Ho is do not reject the manegerial is 'there is NO EVIDENCE'

im confused at this..

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

Question 14: The E was divided by 60 because its unit was SECONDS, whereas the $\sigma$ was given in MINUTES. Therefore, we need to change both of them into the same unit, either seconds or minutes. In this case, I chose to change into minutes. Therefore, E must be divided by 60.

Question 16: The rule is that the hypothesis containing the $"="$ is the null hypothesis. And the opposite is the alternative.

In this case, the claim is 'no more than $25000", which means "less than or equal to 25000", containing the "=" sign. Therefore the null hypothesis is

$H_0:\mu\leq25000$ but in short, we just write $H_0:\mu=25000$

Therefore, the alternative hypothesis is: $H_a:\mu>25000$.

Hope that helps!

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

how about the question 14?

why the Errors should be divided by 60?

but in the question 15 the E not diveded by anything…

Then for the question 16 the hypothesis say that no more than $25000

why you make it (>) not (<)…

sorry ser, disturb you

My regard,

lisa

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

Please note the correction for question 7b and 8b.

7b. Just a typo:

$P(3\leq X\leq6)=P(3)+P(4)+P(5)+P(6)$

8b. The correct answer is:

$P(X\geq3)=1-P(X<3)=1-P(0)-P(1)-P(2)$

$P(X\geq3)=1-0.0498-0.1494-0.2240={\bf 0.5768}$

Good luck with the final exam!!!

Forum category: Hidden / REVISION

Forum thread: Correction for Revision Exercises Solution ]]>

For uniform distribution, the best way is to draw the graph with the range where the variable is uniformed distributed. In this case, it's uniformly distributed between 8 and 21.

If you draw it, and put $P(X\geq7)$, you'll see that the region we want covers all the uniformed region, which means that the probability is 1. This is the same as question (d), where $P(X<22)$.

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

i wanna ask for the revision question 9e

exactly in page 12

why it can be 0??

and it is so tricky

i can understand it before?

thank you

my regard,

lisa

Forum category: Hidden / REVISION

Forum thread: Question 9 ]]>

Forum category: Hidden / Q&A for Group Assignment

Forum thread: More stuff for STATS assignment ]]>

Would you recommend skewness into our findings? Do you think is it better or not?

Forum category: Hidden / Q&A for Group Assignment

Forum thread: More stuff for STATS assignment ]]>

I'm going to give you a special treat with the Group Assignment.

If you finish the report before the deadline, you can send the softcopy to me. I'll comment and suggest areas for improvement so that you can make changes to make a better report.

Please send me your finished report. Don't send the blank report without any serious work there.

Good luck with the assignment!

Vinh Tran

Forum category: Hidden / Announcements on Group Assignment

Forum thread: Special treat for Group Assignment ]]>

so , if we use so many hypothesis testing like 5 until 10 and it support for our statistical conclusion, that is mean we can use it right ^^

thank you ser ^^ we will do our best ^^ hehehe

My regard

lisa

Forum category: Hidden / ASAL

Forum thread: Stat ]]>

The requirements for histogram is only for section 2.1 only. The other parts do not require the histogram. Just put the one that you think is useful and you want to comment something interesting on the histogram. Do not just put it in and say nothing about it.

As to the findings, that is the business conclusion you can get from the hypothesis testing. For example, when you do the hypothesis testing, you find that the loyalty customers tend to spend more value than the regular customers. That's your findings. All other hypothesis testings should lead you to some business conclusions, and that's what you will put in your findings. From a statistical view, they are all hypothesis testing, but the business conclusions will be different for each case as to various aspects of JMarts customers (payment method, age, gender, etc.)

Hope that helps!

Forum category: Hidden / ASAL

Forum thread: Stat ]]>

Im confused in the finding of the report.

How many histogram that we must include in the finding…

=( some people have 2 and 4

what is you opinion?

and which one do you prefer?

is it 2 or 3?

and in our finding, almost the answer is about hypothesis testing in order to test is it success or not..

so is it right that almost our finding consist 5 until 10 hypothesys testing?

thanks ser

my regard,

lisa

Forum category: Hidden / ASAL

Forum thread: Stat ]]>

I would suggest that for which hypothesis testing that you can draw a decisive conclusion on the one-tailed test (like value for Loyalty and Regular), you can use the one-tailed test and say which population mean is larger.

Otherwise, with the cases where you cannot decide on which is larger (like value for cash and credit card), just use the two-tailed test to say if they are significantly different or not, not caring about which one is larger.

Inferring about the population means only based on the sample mean is somewhat biased and inaccurate from a statistical point of view, though.

Have a nice weekend.

Forum category: Hidden / Announcements on Group Assignment

Forum thread: Hypothesis Testing ]]>

miu 1 is the population mean of value that paid in cash.

miu 2 is the population mean of value that paid by credit card.

the 1st time I assum that H0: miu 1=miu 2

Ha: miu 1<miu 2

t crit is -1.66<t test :0.57. so i accept that miu 1 is equal or more than miu 2

the 2nd time I assum that H0: miu 1=miu 2

Ha: miu 1>miu 2

t crit is 1.66> t test 0.57. so i also accpet H0, which is miu 1 is equal or less than miu 2

I try to test with other type like customers type, marial status, even my assumtion is differnt, the results are the same.

But with paymnet method, they are different. So why they are different. And which one should I choose.

Best regards

P/S: If i consider about the sample mean which cash91.40 is and credit card is 89.33. it seems that the 1st time is true

But if i consider at confidence interval with cash is

]�14�and credit card is [84.08:94:59. wht happen if aveage value paid in cash is 90 and credit card is 91. so maybe the 2nd is true.

Forum category: Hidden / Announcements on Group Assignment

Forum thread: Hypothesis Testing ]]>

I mean the revision exercises for the final exam, yellow summary pages.

Forum category: Hidden / REVISION

Forum thread: Week 12 Tutorial - Revision session ]]>

i dont understand this! is it the the one you gave us, i mean the summary of all lectures in yellow pages!????or the lecture 11 revision notes???

Forum category: Hidden / REVISION

Forum thread: Week 12 Tutorial - Revision session ]]>

We won't have any new stuff next week's tutorial.

What I expect you to do for next week tutorial is:

1. * Finish the group assignment*. Remeber to attach the cover sheet and the peer evaluation sheet.

2. * Do the essential exercises* stated in the revision booklet before coming the class.

We will be having the whole 2 hours for revision next week. So, come prepared and make the most out of the time to efficiently review for the final exam.

Good luck with the group assignment and see you in class.

Vinh Tran

Forum category: Hidden / REVISION

Forum thread: Week 12 Tutorial - Revision session ]]>

mstwtd (Nahin)

Forum category: Hidden / Q&A for Group Assignment

Forum thread: Refering to assignment ]]>

1. One-tail or two tail?

It depends on your hypotheses. You have the right to set your own hypotheses and test your hypothesis accordingly. So, follow step 2 in the 8-step in hypothesis testing to determine if it's one-tailed or two-tailed according your hypothesis.

For each question, you may have different hypothesis or the same hypothesis, whatever that you think is appropriate and make sure that in your report, you need to tell me your hypotheses.

2. z-test or t-test?

Again, it depends on your assumption. If you want to use z-test, you need to know the population standard deviations $\sigma_1$ $\sigma_2$ and if you wish to do so, tell me how you can get it from. Otherwise, you can assume that you don't know the population standard deviations and you can choose to do the t-test for : Two-Sample Assuming Equal Variances?

Again, in your report, you need to tell me your assumptions and the test statistics (z or t) that you use for your decision making.

Forum category: Hidden / Q&A for Group Assignment

Forum thread: Refering to assignment ]]>

Do we have use two tail test or one tail test for all the questions. SO, that means we apply one of the hypothesis testing test to all questions? And do we use in using excel: z-test: two sample for means or t-Test: Two-Sample Assuming Equal Variances?

Forum category: Hidden / Q&A for Group Assignment

Forum thread: Refering to assignment ]]>

The group assignment requires us to provide a 95% CI for the estimation of the population mean. Therefore, we need to that to generate that CI (instead of having to do it manually).

Please refer to the assignment - page 2, part 2.1, question 2.

Forum category: Hidden / Q&A for Group Assignment

Forum thread: refering to video part 2 ]]>

Sam: moc.liamg|80iacmaS#moc.liamg|80iacmaS

Nahin:moc.liamg|miharbinihaN#moc.liamg|miharbinihaN

Sueji:

Park:

Note: to Vinh can you please post the email address for sueji and park here please (refering to insearch emails)

Forum category: Hidden / MOSTWANTED

Forum thread: Contact details ]]>

thank

group

Forum category: Hidden / Q&A for Group Assignment

Forum thread: refering to video part 2 ]]>

Forum category: Hidden / Man-Jai-Naz

Forum thread: First ]]>

For this week's tutorial, please do 3 exercises: * 11.11, 13.1 and 14.8* before coming to class.

This week's tutorial will be super-easy. Therefore, I would like to spend more time to help you out with your group assignment.

So, if you need help, this is your chance. You are encouraged to bring your laptops (desktops, if you want to) to class and ask questions, whatever that make you stuck with the group assignment.

P.S: I won't be helping those who are sleeping on the assignment and leaving it to "someone else's job". I will just help those who are really putting their efforts into the assignment. So, please don't come to me with a blank mind and ask me how to do it.

Forum category: Hidden / ANOVA & Simple Regression Analysis

Forum thread: Week 11 Tutorial Preparation ]]>

Please find the complete solution for week 10 tutorial (Hypothesis testing for 2 populations )

Forum category: Hidden / Hypothesis testing for 2 populations

Forum thread: Full solution for Week 10 Tutorial - Hypothesis testing for 2 populations ]]>

If you've got an iPhone, you can download the video tutorials and sync them to iPhone. Access your learning materials at any time, anywhere you feel like to learn !

Note: This is a folder link to Megaupload services. If you don't have a premium account, it will take time to download all.

Forum category: Hidden / Excel skills/Tips

Forum thread: Video tutorials for iPhone ]]>

In the resources from UTSOnline, it was shown to you how to find the Data Analysis Tool in Excel 2003.

For those of you using Excel 2007 and cannot find the Data Analysis Tool. Here is how.

Forum category: Hidden / Excel skills/Tips

Forum thread: Finding Data Analysis Tool in Excel 2007 ]]>

I've uploaded the video tutorials up ! Please have a look.

If you still cannot get it. You can redo the process, capturing your PC screens for each step and send it over to me so I can see where you might go wrong. Or, you can bring your laptop to our tutorial next week.

Forum category: Hidden / WHATEVER

Forum thread: doubt ]]>

Would you mind checking it again? Just change the link a little bit.

Forum category: Hidden / Hypothesis testing for a single population

Forum thread: Solution for Week 9 Tutorial - Hypothesis Testing for a single population ]]>

i am trained in microsoft basic application skill but unfortunately for some reason i am not able to make the charts, i.e histograms and all that! and since i had another class that day i couldnt see how you did it. can you please show me how to do it on wednesday before tut??? i want to know where i am going wrong!??? please help! i have the rest of the descriptive stats ready for my group!

regards,

nikita..

Forum category: Hidden / WHATEVER

Forum thread: doubt ]]>

Forum category: Hidden / Hypothesis testing for a single population

Forum thread: Solution for Week 9 Tutorial - Hypothesis Testing for a single population ]]>

Here are the video tutorials.

**Part 1**

**Part 2**

**Part 3**

**Part 4**

Forum category: Hidden / Excel skills/Tips

Forum thread: Video tutorials for Group Assignment - 4 parts in total ]]>

Forum category: Hidden / Hypothesis testing for a single population

Forum thread: Solution for Week 9 Tutorial - Hypothesis Testing for a single population ]]>

Forum category: Hidden / Hypothesis testing for a single population

Forum thread: Solution for Week 9 Tutorial - Hypothesis Testing for a single population ]]>

Again, as you will have your last quiz this week and the group assignment, I reckon that it would be not very realistic to get you guys do any exercise for this week's tutorial.

Therefore, for this week's tutorial:

1. You * do not have to do any exercise for the new topic* (Hypothesis Testing for 2 populations)

2. Invest all your time for * quiz 3*.

3. If you want to change your group, do so and let me know in the tutorial. No more changes will be considered afterwards.

4. You are * encouraged to bring your laptops* to this week's tutorial since I will be talking more about the group assignment and if you have any troubles with the technical part in Excel, I'll be happy to help you out.

5. If you haven't * read the first 5 pages* of the Group Assignment (which I suppose you already did last week), please do so before this week's tutorial.

See you in class.

Forum category: Hidden / Hypothesis testing for 2 populations

Forum thread: This week's tutorial preparation ]]>

Yes, that's a typo :)

I will go through the class in more details on the group assignment (with step by step instruction and my expectations of the outcomes) in this week's tutorial. I suggest that you put your effort on quiz 3 for the time being and then, the group assignment after this week's tutorial.

Forum category: Hidden / Q&A for Group Assignment

Forum thread: 2.1 Analysis by customer ]]>