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Advertisers fear that users of DVRs (digital video recorders) will "fast forward" past commercials when they watch a recorded program. A leading British pay television company told its advertisers that this effect might be offset because DVR users watch more TV. A sample of 25 DVR users showed a daily mean screen time of 2 hours and 30 minutes with a standard deviation of 13 minutes, compared with a daily mean of 2 hours and 6 minutes with a standard deviation of 12 minutes for a sample of 25 non-DVR users.
a-1) Construct a 99 percent confidence interval for the difference in mean TV watching. (Round your answers to 2 decimal places.)
The 99% confidence interval is from to
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Estimate the population mean
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