Questions Exercise 10.05 Algo (Inferences About the Difference Between Two Population Means: Sigmas Known) Question 2 of 11 1. Hint(s) Check My Work (3 remaining) 2. O 3. O 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 40 male consumers was $136.2, and the average expenditure in a sample survey of 36 female consumers was $61.06 4 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 $16. The z 5. O value is 2.576. 6 O Round your answers to 2 decimal places. 7. O a. What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females? 8. O b. At 99% confidence, what is the margin of error? 9. O 10. O c. Develop a 99% confidence interval for the difference between the two population means. to 11. O