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 = 4.42 minutes.Calculate the appropriate test statistic to test the hypothesis that the time has increased from last year.
A)2.38
B)1.19
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: t = (sample mean - population mean) / (sample standard deviation / sqrt(sample size)). Substituting the given values: t = (51.05 - 50) / (4.42 / sqrt(25)) = 1.19.

Last Year,during an Investigation of the Time Spent Reading E-Mails