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A study by a web metrics firm Hitwise showed that in 2008 the mean time spent

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A study by a web metrics firm Hitwise showed that in 2008 the mean time spent per visit to Facebook was 19.5 minutes. A random sample of 100 Facebook users in 2015 showed a mean time per visit of 21.5 minutes with a standard deviation of 8.1 minutes. At a significance level of 0.05, can we conclude that the mean time per visit to Facebook has increased since 2008?

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[Solved] A study by a web metrics firm Hitwise showed that in 2008 the mean time spent

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