Mathematics, 19.11.2020 23:50 loishsu4936

A research council wants to estimate the mean length of time the average US adult spends watching TV using digital video recorders (DVR) each day. The council took a sample of 20 US adults and found the mean to be 15.1 minutes. If the mean amount of time is between 14.62 and 15.58 minutes with a standard deviation of 1.3 minutes, which approximate confidence level does the range represent?

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