12.20 Refer to Exercise 12.5. a Find a 90% confidence interval for . Interpret the interval. b...

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12.20 Refer to Exercise 12.5.

a Find a 90% confidence interval for .

Interpret the interval.

b What would happen to the width of the confidence interval in part

(a) if you quadrupled the number of observations in the two samples?

c Find a 95% confidence interval for .

d Approximately how many observations would be required if you wanted to be able to estimate a population mean correct to within 0.4 with probability equal to 0.95?

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