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Suppose that the amount of time Americans spend watching TV per day is normally distributed with a standard deviation of 1 hour. A sample of 144 people is selected at random, and the sample mean computed as 3 hours.

Determine the 90% AND 95% confidence interval estimate of the population mean.

Determine the 90% confidence interval estimate of the population mean if the sample size is changed to 121.

Determine the 90% confidence interval estimate of the population mean if the population standard deviation is changed to 0.8.

Determine the 90% confidence interval estimate of the population mean if the sample mean is changed to 3.5

Determine the sample size that is required to estimate a population mean to within 0.4 hours with a 90% confidence.

What happens to the width of a confidence interval in each of the following situations?

Sample size increases
Sample size decreases
Population standard deviation increases
Population standard deviation decreases
Sample mean increases
Sample mean decreases

Business Management, Management Studies

  • Category:- Business Management
  • Reference No.:- M9169225

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