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Question: a psychologist finds that the number of employee errors increases...

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18. A psychologist finds that the number of employee errors increases as the day progress reaching a peak between 3:00 and 5:00 PM. 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 No break group 5 6 7 8 9 6 5 7 6 Break group 2 4 3 4 4 3 1 5 4 Before evaluating the significance of the difference between the means of the two groups, it is important to determine whether the variances are homogeneous. Do the two variances differ significantly? Calculate the value of F and test for significance using a 05 19. Does it appear that the coffee break significantly affects the number of errors? Calculate the value of t using a 05, two-tailed
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