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

Multiple Choice

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