Problem
Five treatments for fever blisters, including a placebo, were randomly assigned to 30 patients, with 6 patients receiving each treatment. The data in the table below are the numbers of days from initial appearance of the blisters until healing is complete.
|
Placebo
|
Treatment 1
|
Treatment 2
|
Treatment 3
|
Treatment 4
|
|
5
|
4
|
6
|
7
|
9
|
|
8
|
6
|
4
|
4
|
3
|
|
7
|
6
|
4
|
6
|
5
|
|
7
|
3
|
5
|
6
|
7
|
|
10
|
5
|
4
|
3
|
7
|
|
8
|
6
|
3
|
5
|
6
|
Based on the scenario above answer the following questions:
A. Identify the dependent variable.
B. Which statistical test is appropriate to use on these data?
C. Using 5% level, determine whether five treatments differ significantly with regards to healing fever blisters? Specify the hypotheses tested in this study.
D. Carry out the hypothesis test(s) for part c above. What is the appropriate conclusion for this test?
E. Indicate the test used to compare individual means if the null hypothesis is rejected.
F. Perform the appropriate test if necessary according to your response in part e above.