A psychologist wanted to find ways to reduce stress among college students durin

Question

A psychologist wanted to find ways to reduce stress among college students during finals week. She measured students stress levels on a 1-10 scale (1 = no stress; 10 = extreme stress) before and after a time management workshop. She wanted to see if improving time management reduced stress. Here are the data:

Before: 10, 8, 8, 4, 5, 6, 3, 7, 5

After: 7, 4, 6, 4, 3, 7, 1, 7, 2

1) What is the n in this sample?

2) What type of test should we run?

3) What is the null and alternative hypothesis?

   Ho:

   H1:

Explanation / Answer

1. Here n = 9

2. This test is a perfect candidate of paired T-test. Because here the same group is studied before and after the treatement.

3. Below are the null and alternate hypo
H0: mu1 - mu2 = 0
H1: mu1 - mu2 > 0 (after treatement stress level reduced)

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