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Exercise 10.05 Algo (Inferences About the Difference Between Two Population Means: Sigmas Known) Question 2 of 9 Check My Work (5 remaining) USA Today reports that the average expenditure on Valentine's Day was expected to be $100.89. Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 42 male consumers was $138.40, and the average expenditure in a sample survey of 30 female consumers was $69.74. Based on past surveys, the standard deviation for male consumers is assumed to be $35, and the standard deviation for female consumers is assumed to be $18, 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? b. At 90% confidence, what is the margin of error? c. Develop a 99% confidence interval for the difference between the two population means. to Check My Work (5 remaining) Exercise 10.05 Algo (Inferences About the Difference Between Two Population Means: Sigmas Known) Question 2 of 9 Save Submit Assignment for Grading