Question

We analyze the percent tip left on 157 bills from the First Crush bistro in Northern New York State. The mean percent tip left on the 106 bills paid cash was 16.39 with a standard deviation of 5.05. The mean percent tip on the 51 bills paid with a credit card was 17.10 with a standard deviation of 2.47. Construct and interpret a 95% confidence interval for the difference in mean percent of the bill left as a tip.

Answer 1

Hello

YOUR REQUIRED ANSWER IS CONFIDENCE INTERVAL : (-1.886,0.466)

Given data: