A study by the Web metrics firm Hitwise showed that the mean time spent per visit to Facebook was 19.5 minutes. Assume the standard deviation is σ= 8 minutes. Suppose that a simple random sample of 100 visits in August 2009 has a sample mean of x= 21.5minutes. A social scientist is interested in knowing whether the mean time of Facebook visits has increased. Use an α= 0.05 level of significance to conduct a test about thishypothesis.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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A study by the Web metrics firm Hitwise showed that the mean time spent per visit to Facebook was 19.5 minutes. Assume the standard deviation is σ= 8 minutes. Suppose that a simple random sample of 100 visits in August 2009 has a sample mean of x= 21.5minutes. A social scientist is interested in knowing whether the mean time of Facebook visits has increased. Use an α= 0.05 level of significance to conduct a test about thishypothesis.

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