My Notes Example 10.14A growing concern of employers is time spent in activities

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My Notes Example 10.14A growing concern of employers is time spent in activities like surfing the internet and emailing friends during work hours. The San Luis Obispo Tribune summarized the findings 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 wasted 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 10 employees was contacted and asked about daily wasted time at work. (Participants would probably have to be guaranteed anonymity to obtain truthful responses!) The resulting data are the following: 108 112 117 130 111 131 113 113 105 128 Summary quantities are n = 10, x = 116.80, and s = 9.45 Do these data provide evidence that the mean wasted time for this company is less than 120 min? To answer this question, let's carry out a hypothesis test with = 0.05 1, = mean daily wasted time for employees of this company 2. Hu: = 120 3, Ha:

Explanation / Answer

Conclusions :

1. Pvalue is greater than 0.05 . We fail to reject the null hypothesis. In this case there is sufficient evidance to concluded that employees at this company waste less than 120 min per 8 hour work day. .

2. Because P value is greater than alpha. We fail to reject Null hypothesis . That concluded that employees at this company waste less than 120

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