# Quadro Corporation Has Two Supermarket Stores In A City The Company’S Quality Control Department Wanted To Check

Chapter 10, Section 10.2, Problem 022 Your answer is partially correct. Try again. Quadro Corporation has two supermarket stores in a city. The company’s quality control department wanted to check if the customers are
equally satisfied with the service provided at these two stores. A sample of 396 customers selected from Supermarket I produced a mean
satisfaction index of 7.3 (on a scale of 1 to 10, 1 being the lowest and 10 being the highest) with a standard deviation of 0.77. Another
sample of 376 customers selected from Supermarket II produced a mean satisfaction index of 8.0 with a standard deviation of 0.59.
Assume that the customer satisfaction index for each supermarket has unknown but same population standard deviation. Let [.11 be the mean satisfaction index for customers selected from Supermarket I, and p2 be the mean satisfaction index for customers
selected from Supermarket II. a. Construct a 90% confidence interval for the difference between the mean satisfaction indexes for all customers for the two supermarkets. Round your answers to two decimal places. T: toquot; Statistics and Probability