Question

You measure 35 textbooks' weights, and find they have a mean weight of 32 ounces. Assume the population standard deviation is 10.4 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight.

Give your answers as decimals, to two places

____________< μ <_________

Answer 1

Here population standard deviation is known, so we will use z distribution to find CI

z value for 95% CI is 1.96 as P(-1.96<z<1.96)=0.95

So Margin of Error is

Hence CI is

So answer is