eBook 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 $130.38, and the average expenditure in a sample survey of 34 female consumers was $65.36. Based on past surveys, the standard deviation for male consumers is assumed to be $34, and the standard deviation for female consumers is assumed to be $12. 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? 65.02 b. At 99% confidence, what is the margin of error? c. Develop a 99% confidence interval for the difference between the two population means. 47.57 to 82.47 Hide Feedback