Question

For each example below you would start to construct a confidence interval by identifying which distribution should be used to find the margin of error. It is possible that you won't be able to use either distribution.

(a) a confidence interval for a population proportion where n = 66 and there are 63 successes in your sample leading to a sample proportion of 0.955

A. z-distribution

B. t-distribution     

C. neither distribution

(b) a confidence interval for a population proportion where n = 39 and there are 29 successes in your sample leading to a sample proportion of 0.744

A. z-distribution

B. T-distribution     

C. neither distribution

Answer 1

Solution:

a)

We use Z - distribution

A) z-distribution

Option A is correct.

b)

A. z-distribution

Option A is correct.