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Question 3 [4 marks] A Supermarket manager want to estimate time spend by customers when doing their purchases. He obser
Posted: Sun Oct 03, 2021 12:35 pm
by answerhappygod
- Question 3 4 Marks A Supermarket Manager Want To Estimate Time Spend By Customers When Doing Their Purchases He Obser 1 (32.16 KiB) Viewed 102 times
Question 3 [4 marks] A Supermarket manager want to estimate time spend by customers when doing their purchases. He observed the entry and departure times of 86 randomly selected cus- tomers from the supermarket. The sample mean time was found to be 27.9 minutes. Assume a population standard deviation of 10.5 minutes and that shopping time is approximately normally distributed. Construct 90% confidence interval for the actual time spend by customers doing their shopping. Interpret your answer.