Confidence interval estimate of population

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Reference no: EM1318848

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

Reference no: EM1318848

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