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The average expenditure on Valentine's Day was expected to be $100.89 (USA Today, February 13, 2006). Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 52 male consumers was $138.32, and the average expenditure in a sample survey of 30 female consumers was $67.55. Based on past surveys, the standard deviation for male consumers is assumed to be $33, and the standard deviation for female consumers is assumed to be $14. The z value is 2.576. Round your answers to 2 decimal places. a. What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females? 67.03 b. At 99% confidence, what is the margin of error? 17.07 % c. Develop a 99% confidence interval for the difference between the two population means. 49.96 to 84.10 Hide Feedback Partially Correct Check My Work (3 remaining) Oz Icon Key