Question

A growing concern of employers is time spent in activities like surfing the Internet and e-mailing friends during work hours. The San Luis Obispo Tribune summarized the fundings from a survey of a large sample of workers in an article that ran under the headline "Who Goofs Off 2 Hours a Day? Most Workers, Survey Says" (August 3, 2006). Suppose that the CEO of a large company wants to determine whether the average amount of waisted time during an 8-hour work day for employees of her company is less than the reported 120 minutes. Each person in a random sample of 12 employees was contacted and asked about daily waisted time at work. The resulting data are the following:

108   112 117 128 130 111 131 116 113 113 105    128

The CEO wants to determine if these data provide evidence that the mean wasted time for this company is less than 120 minutes. Assuming that the population distribution is approximately normal, find the test statistics t, round it to one decimal place.

Answer choices

a) -0.8

B) -1

C) -1.1

D) -0.9

Answer 1

Ho: M=120 versux Ha: M4120 Culess than 120) ni = 1412 - 02.6667) Sa-, ***** **:23) -\.(167066 – (1412)2) = 19.1481 The test statistic t= -o (117.8667-126) t: -0.8835. -L-0.97 option V2