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Determine the minimum sample size required when you want to be 90​% confident that the sample...

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Statistics

Determine the minimum sample size required when you want to be90​% confident that the sample mean is within one unit of thepopulation mean and sigma=10.8. Assume the population is normallydistributed.

You are given the sample mean and the population standarddeviation. Use this information to construct the​ 90% and​ 95%confidence intervals for the population mean. Interpret the resultsand compare the widths of the confidence intervals.

From a random sample of 45 business​ days, the mean closingprice of a certain stock was ​$116.70. Assume the populationstandard deviation is ​$11.02. The​ 90% confidence interval is

Construct the indicated confidence interval for the populationmean using the​ t-distribution. Assume the population is normallydistributed.

c=0.99 x =14.2​, s= 0.73 ​, n=14

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