Question

The average weight is supposed to be 45.9 grams and standard deviation .03 grams. In a sample of 30, the mean weight is 45.88 grams. Do these golf balls weigh less than they are supposed to? What is the confidence interval with 95% confidence?

A. (45.89, 45.91)

B. (45.8, 46)

C. (45.866, 45.894)

D. (45.869, 45.891)

Answer 1

the correct answer is (C) (45.866, 45.894), which is the confidence interval for the population mean with 95% confidence.