Mathematics, 23.04.2021 03:00, hanchinsko12

ustomers at Costco spend an average of $130 per trip (The Wall Street Journal, October 6, 2010). One of Costco's rivals would like to determine whether its customers spend more per trip. A survey of the receipts of 25 customers found that the sample mean was $135.25. Assume that the population standard deviation is $10.50 and that spending follows a normal distribution. Use the .05 level of significance. Calculate the critical value

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ustomers at Costco spend an average of $130 per trip (The Wall Street Journal, October 6, 2010). One...