Lab 8 / Tutorial 1
The max grade for this lab is 110 but the scale is still 100 points. The 10 points are extra
credit.
The following video might be helpful:
1-sided t-test
Note:
numbers are truncated. There is no need to use any data to perform actual test. The actual
P
-value is given to you.
Set-up
: At the end of the semester, a survey was conducted where students are asked 5 so-called
“embedded“ questions. The idea was to compare the students that are taking the new Stats class
versus the traditional Stats class and to see if there is any difference in the average score of the 5
questions.
What test should be run? (Regression, One-sided t-test or Two-sided t-test)
(Click for
answer)
In this case, one wants to COMPARE if the two averages are significantly DIFFERENT,
thus one needs to conduct TWO-SIDED T-TEST.
What is the
P
-value?
(Click for answer)
After typing = ttest(Array1, Array2, 2, 3), we find that the
P
-value is 0.026
What is the Statistical interpretation?
(Click for answer)

What is the conclusion?
(Click for answer)

Lab 8 / Tutorial 2
Note:
numbers are truncated. There is no need to use any data to perform actual test. The actual
P
-value is given to you.
Set-up
: Management introduced a new product and they claimed that its sales will be better than
that of the old product. You are given the data to conduct the appropriate test and comment.

What test should be run? (Regression, One-sided t-test or Two-sided t-test)
(Click for
answer)
In this case, one wants to COMPARE if the new product has HIGHER sales than the old,
thus one needs to conduct ONE-SIDED T-TEST.
What is the
P
-value?
(Click for answer)
After typing = ttest(Array1, Array2, 1, 3), we find that the
P
-value is 0.0019
What is the Statistical interpretation?
(Click for answer)