Question

The random sample shown below was selected from a normal distribution. 9, 7, 9, 4, 6, 1 Complete parts a and b. a. Construct a 95% confidence interval for the population mean μ. (, ) (Round to two decimal places as needed.) b. Assume that sample mean x and sample standard deviation s remain exactly the same as those you just calculated but that are based on a sample of n = 25 observations. Repeat part a. What is the effect of increasing the sample size on the width of the confidence intervals? The confidence interval is __. (Round to two decimal places as needed.) What is the effect of the sample size on the width of the confidence interval?

          The random sample shown below was selected from a normal distribution.
9, 7, 9, 4, 6, 1

Complete parts a and b.
a. Construct a 95% confidence interval for the population mean μ.
(__, __) (Round to two decimal places as needed.)
b. Assume that sample mean x and sample standard deviation s remain exactly the same as those you just calculated but that are based on a sample of n = 25 observations. Repeat part a. What is the effect of increasing the sample size on the width of the confidence intervals? The confidence interval is __. (Round to two decimal places as needed.)
What is the effect of the sample size on the width of the confidence interval?

Added by Kimberly L.

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