Question 1

You measure 44 textbooks' weights, and find they have a mean weight of 75 ounces. Assume the population is normally distributed with a standard deviation of 8.8 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers correct to at least two decimal places. Lower Limit = Upper Limit =

Question2

You measure 23 backpacks' weights, and find they have a mean weight of 50 ounces. Assume the population standard deviation is 9.5 ounces. Based on this, construct a 99% confidence interval for the true population mean backpack weight. Give your answers as xMExME, to two decimal places _______ ounces

Question3

In constructing a confidence interval for the population mean using the t-distribution, we often need the degrees of freedom (df), confidence level, and the critical value.

Use the Student t-distribution to determine the missing values in the table below.

Report the positive t critical value accurate to 3 decimal places.

Sample size	degrees of freedom	confidence level	critical value (t)
	17		2.110
	13		3.012
9		90%
23		98%