Question

1. A doctor wants to know if taking a cough drop really does make a difference in the number of times someone coughs. He recruits 8 subjects, and for each subject he recorded the number of coughs in an hour, then had them take a cough drop. After taking the cough drop he again recorded the number of time the person coughs. Does take a cough drop result in a significant difference in number of coughs? Use α = .05.

Subjects	Before	After
1	22	13
2	18	16
3	16	17
4	18	15
5	13	9
6	20	15
7	19	12
8	15	10

Step 1: State the null and alternative hypotheses in symbols.

Step 2: Set up the criteria for making a decision. That is, find the critical value(s).      

Step 3: Compute the appropriate tests statistic. Show your work!!

Step 4: Evaluate the null (circle one): REJECT     FAIL TO REJECT

Step 5: Based on your evaluation of the null hypothesis, what is your conclusion (in words)?

Answer 1