Basic Computation: Confidence Interval Suppose x has a mound-shaped distribution with s 5 9. A random sample of size 36 has sample mean 20.

(a) Check Requirements Is it appropriate to use a normal distribution to compute a confidence interval for the population mean m? Explain.

(b) Find a 95% confidence interval for m.

(c) Interpretation Explain the meaning of the confidence interval you computed.

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