Hypothesis testig for paired sample t test.
A company wanted to know if attending a course on "how to be a successful salesperson" can increase average sales of its employees. The company sent six of its salespersons to attend this course. The following table gives the oneweek sales of these salespersons before and after they attended this course:
Before

12

18

25

9

14

16

After

18

24

24

14

19

20

Differences







First find out the 6 differences (Before course sales  After course sales)
Before

12

18

25

9

14

16

After

18

24

24

14

19

20

Differences

6

6

1

5

5

4

Where,
Differences = before course sales  After course sales
1. Find out the mean of the 6 differences
2. Find out the standard deviation of the differences
3. To find out whether the course is effective in increasing sale, the appropriate set of hypothesis for testing is (Be careful which one you choose!)
4. The appropriate test to use is
a. Ttest b. 1PropZtest c. ZTest d. Chisquare test