8.34 Birth weights of elephants The birth weights (in kilograms) of five elephants, selected randomly, are 133,

Question:

8.34 Birth weights of elephants The birth weights (in kilograms)

of five elephants, selected randomly, are 133, 120, 97, 106, 124 (Source: www.elephant.se).

a. Using the web app, software or a calculator, verify that the 95% confidence interval for the population mean is

(98.11, 133.89).

b. Name two things you could do to get a narrower interval than the one in part a.

c. Construct a 99% confidence interval. Why is it wider than the 95% interval?

d. On what assumptions is the interval in part a based?

Explain how important each assumption is.

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