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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 areequally satisfied with the service provided at these two stores. A sample of 396 customers selected from Supermarket I produced a meansatisfaction 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. Anothersample 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 customersselected 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: to"
