Daily Tip Revenue for a Waitress Information from a sample of 157 restaurant bills collected at the First Crush bistro is available in RestaurantTips. Two intervals are given below for the average tip left at a restaurant; one is a 90% confidence interval and one is a 99% confidence interval.

Interval A: 3.55 to 4.15

Interval B: 3.35 to 4.35

b) One waitress generally waits on 20 tables in an average shift. Give a range for her expected daily tip revenue, using both 90% and 99% confidence intervals. Round your answers to the nearest integer.

Confidence level		Confidence interval
90%	:	__________________	to	___________________
99%	:	__________________	to	_________________