# Question

In developing Procedure 8.1, we assumed that the variable under consideration is normally distributed.

a. Explain why we needed that assumption.

b. Explain why the procedure yields an approximately correct confidence interval for large samples, regardless of the distribution of the variable under consideration.

a. Explain why we needed that assumption.

b. Explain why the procedure yields an approximately correct confidence interval for large samples, regardless of the distribution of the variable under consideration.

## Answer to relevant Questions

Refer to Procedure 8.1. a. Explain in detail the assumptions required for using the z-interval procedure. b. How important is the normality assumption? Explain your answer. x-bar = 20, n = 36, σ = 3, confidence level = 95% We provide a sample mean, sample size, population standard deviation, and confidence level. In each case, use the one-mean z-interval procedure to find a confidence interval ...Data on investments in the high-tech industry by venture capitalists are compiled by Venture One Corporation and published in America's Network Telecom Investor Supplement. A random sample of 18 venture capital investments ...The Bureau of Justice Statistics provides information on prison sentences in the document National Corrections Reporting Program. A random sample of 20 maximum sentences for murder yielded the data, in months, presented on ...Refer to Exercise 8.3. Assume that recent wedding costs in the United States are normally distributed with a standard deviation of $8100. a. Determine a 95.44% confidence interval for the mean cost, μ, of all recent U.S. ...Post your question

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