Last year, during an investigation of the time spent reading e-mails on a daily basis, researchers found that on Monday the average time was 50 minutes. Office workers claim that with the increased spam and junk mail, this time has now increased. To conduct a test, a sample of 25 employees is selected with the following results: sample mean = 51.05 minutes and sample standard deviation = 14.2 minutes. Assume times are normally distributed.
-The appropriate test statistic to test the hypotheses is _____.
A)2.38
B)0.37
C)-1.19
D)1.76
E)-1.76

Question

Quizplus · Accepted Answer

The test statistic is calculated using the formula for a one-sample t-test: (sample mean - population mean) / (sample standard deviation / sqrt(sample size)). Plugging in the values: (51.05 - 50) / (14.2 / sqrt(25)) = 0.37.

Last Year, During an Investigation of the Time Spent Reading