Dr. Johnson, a psychologist and researcher, was interested in assessing whether

Question

Dr. Johnson, a psychologist and researcher, was interested in assessing whether stress affects health. She measured student stress levels immediately after exposure to two stressors. The first stressor was spontaneous bursts of loud noise. The second stressor involved asking students to give an extemporaneous speech in front of the other participants. Stress levels were measured by asking students to complete brief self-report measures of stress immediately after exposure to the two stress conditions. Dr Johnson hypothesized that students would report higher stress after the public speaking stressor compared to the noise stressors. Can Dr. Johnson use attest to test her hypothesis? Why or why not?

Explanation / Answer

Yes. Dr. Johnson can use a t test in given situation because

1) Data is collected in a random way.

2) Each observation is independent of other.

3) Sample distribution will remain normal or approximately normal.

4) Population standard deviation is unknow.

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