When a confidence interval for a population proportion is constructed for a sample size n = 30 and the value of = .4,the interval is based on:
A)The z distribution
B)The t distribution
C)The exponential distribution
D)The Poisson distribution
E)None of the above

Question

When a confidence interval for a population proportion is constructed for a sample size n = 30 and the value of  = .4,the interval is based on:
A)The z distribution 
B)The t distribution 
C)The exponential distribution 
D)The Poisson distribution 
E)None of the above

Quizplus · Accepted Answer

When the sample size is greater than or equal to 30 and the sample proportion is not close to 0 or 1, the confidence interval for a population proportion is based on the z distribution. Therefore, choice A is the best choice.

When a Confidence Interval for a Population Proportion Is Constructed