Question

Use the information to construct 90% and 99% confidence intervals for the population mean. Interpret the results and compare the widths of the confide

Confidence intervals
ANSWERED
asked 2021-06-20
Use the information to construct 90% and 99% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. A group of researchers estimates the mean length of time (in minutes) the average U.S. adult spends watching television using digital video recorders (DVRs) and other forms of time-shifted television each day. To do so, the group takes a random sample of 30 U.S. adults and obtains the times (in minutes) below.
29 12 23 24 33 24 28 31 18 27 27 32 17 13 17 12 21 32 26 16 28 28 21 24 29 13 20 13 21 27
From past studies, the research council assumes that σσ is 6.5 minutes.

Answers (1)

2021-06-21
90% confidence interval: (22.0452, 23.6882)
90% confidence interval: (19.8109, 25.9225)
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