a. The proportion of successes in a random sample of

a. The proportion of successes in a random sample of 400 was calculated as 50%. Estimate the population proportion with 95% confidence.

b. Repeat part (a) with p̂ = 33%.

c. Repeat part (a) with p̂ = 10%.

d. Discuss the effect on the width of the confidence interval estimate of reducing the sample proportion.


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