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In: Statistics and Probability

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

Determine the minimum sample size required when you want to be 90​% confident that the sample mean is within one unit of the population mean and sigma=10.8. Assume the population is normally distributed.

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

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

Construct the indicated confidence interval for the population mean using the​ t-distribution. Assume the population is normally distributed.

c=0.99 x =14.2​, s= 0.73 ​, n=14

Solutions

Expert Solution

Given:

Standard deviation, = 10.8

Margin of error = E = 1
Level of significance , = 1-0.90 = 0.1

Therefore 99% Confidence interval for population mean ( ) is ( 13.6124, 14.7876)

orchestra answered 1 year ago
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