# Question

What is meant by saying that a 1 − α confidence interval is

a. Exact?

b. Approximately correct?

a. Exact?

b. Approximately correct?

## Answer to relevant Questions

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 ...Suppose that you have obtained data by taking a random sample from a population. Before performing a statistical inference, what should you do? x-bar = 55, n = 16, σ = 5, confidence level = 99% 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 ...Refer to Exercise 8.32. a. Find a 90% confidence interval for μ. b. Why is the confidence interval you found in part (a) shorter than the one in Exercise 8.32? c. Draw a graph similar to that shown in Fig. 8.5 on page 315 ...Refer to Exercise 8.33. a. Determine and interpret a 99% lower confidence bound for the mean cadmium level of all Boletus pinicola mushrooms. b. Compare your one-sided confidence interval in part (a) to the (two-sided) ...Post your question

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