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The document discusses using a sample of 30 high school students to test whether the average time spent on Facebook is 20 minutes as claimed in an article. The sample mean was 7.51 minutes with a standard deviation of 8.48 minutes. This supports using a left-tailed test with null hypothesis of 20 minutes and alternative of less than 20 minutes. With a significance level of 0.05 and a t-value of -9.43, the p-value is less than 0.0005, so the null hypothesis is rejected in favor of the alternative that studen

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