Question

 

A. Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval for a sample of size 119 with 60 successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. 95% C.I. =___

B. We wish to estimate what percent of adult residents in a certain county are parents. Out of 100 adult residents sampled, 81 had kids. Based on this, construct a 90% confidence interval for the proportion ππ of adult residents who are parents in this county.
Give your answers as decimals, to three places. ___< pie <___

C. If n = 460 and ˆpp^ (p-hat) = 0.15, construct a 95% confidence interval. Give your answers to three decimals___<p<___

Again, =tinv(...)or =confidence(...) etc?

Answer 1