Question: A psychologist finds that the number of employee errors increases as the day progresses, reaching a peak between 3:00 and 5:00 p.m. He divides a sample of 20 employees into two groups. One group proceeds on the same work schedule as before, but the other group takes a 15-minute coffee break from 2:45 to 3:00. The subsequent number of errors made between 3:00 and 5:00 are listed below.

No Break Group 5 6 7 4 8 9 6 7 6

Break Group 2 3 4 3 4 4 3 1 5 4

State the null hypothesis.

State the alternative 2 tailed hypothesis. Use alpha=.05 2 tailed.

Compute the appropriate t-test.

SSno break= SS2 break=

T=

State the critical t needed for significance. (careful with the signs)

Compute omega squared.

Compute the appropriate Cohen’s d=

State your conclusions.

Calculate the 95% confidence interval for the observed difference between the two means.

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