# Question

a. A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80. Determine the 95% confidence interval estimate of the population mean.

b. Repeat part (a) with a sample size of 100.

c. Repeat part (a) with a sample size of 400.

d. Describe what happens to the confidence interval estimate when the sample size increases.

b. Repeat part (a) with a sample size of 100.

c. Repeat part (a) with a sample size of 400.

d. Describe what happens to the confidence interval estimate when the sample size increases.

## Answer to relevant Questions

a. Given the following information, determine the 98% confidence interval estimate of the population mean:b. Repeat part (a) using a 95% confidence level.c. Repeat part (a) using a 90% confidence level.d. Review parts ...a. Given the following information, determine the 90% confidence interval estimate of the population mean using the sample median.Sample median = 500, σ = 12, and n = 50b. Compare your answer in part (a) to that produced in ...H0: µ = 100H1: µ ≠ 100σ = 10, n = 100, x̄ = 100, α = .05Calculate the value of the test statistic, set up the rejection region, determine the p-value, interpret the result, and draw the sampling distribution.For each of Exercises 11.48–11.50, draw the sampling distributions similar toFigure.Suppose that in Example 11.1 we wanted to determine whether there was sufficient evidence to conclude that the new system would not be cost-effective. Set up the null and alternative hypotheses and discuss the consequences ...Post your question

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