You measure 42 textbooks' weights, and find they have a mean weight of 62 ounces. Assume the population standard deviation is 8.7 ounces. .

Question

Based on this, construct a 95% confidence interval for the true population mean textbook weight.

Answer 1

CI = sample mean +/- z-critical value * Standard Deviation/Square Root(Sample Size)

sample mean = 62

z-critical value = 1.96

standard deviation = 8.7

sample size = 42

plug the values in and compute