1. Study of obesitymales and females between the ages of 20 and 75:

	n	# Overweight
Males	120	18
Females	280	70

What is p-hat (males)? -----

What is p-hat (females)?

What is p-hat, the weighted average of the two proportions?

2. If x-bar = 100 and s = 20 (units completely theoretical and unimportant) and n = 16, calculate a 95% confidence interval for the true population mean :

Lower limit (to two decimal places) is: Upper limit (to two decimal places) is: Value of t/Z used is: