7.123 Sign test for time using smartphone.
CASE 7.1 Example 7.1 (page 361) gives data on the daily number of minutes eight students at your institution use their smartphones. Is there evidence that the median amount of minutes is less than 120 minutes (2 hours)? State the hypotheses, carry out the sign test, and report your conclusion.
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. The data are not significant at the 5% level, and there is not enough evidence that the median is less than 120.