Question: (a) Using a normal distribution table, find the critical value z that should be used to construct (1) a 75% confidence interval; (2) a 99.9%

(a) Using a normal distribution table, find the critical value z that should be used to construct (1) a 75% confidence interval; (2) a 99.9% confidence interval.

(b) A statistician constructed a confidence interval p = 30% 5% for some population propor- tion using a sample of size 400. What confidence level did he use?

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