C se Mind Tap - Cengage Learning 2 Rounding Numbers Calculator + ng.cengage.com/static/nb/ui/evo/index.html?deploymentId=59965217903652740813033898&elSBN 9780357131596&id=1714112304&snapshotId=3332513& CENGAGE MINDTAP Assignment 9 * OF Q Search this course Home urses Assignment: Assignment 9 0 X Assignment Score: 60.47% Save Submit Assignment for Grading Question 1 of 5 A-Z atalog and Study Tools Lental Options Questions Exercise 10.05 (Inferences About the Difference Between Two Population Means: Sigmas Known) 1. College Success Tips 2. Career Success Tips 3. 4. Help 5. Give Feedback Check My Work 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 $135.67, and the average expenditure in a sample survey of 30 female consumers was $68.64. 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 $20. 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? esc i b. At 99% confidence, what is the margin of error? c. Develop a 99% confidence interval for the difference between the two population means. to $ 2 3 4 M 31 % 25 6 ab q W e r t alt a S d f g 60 N y hp & 27 *80 2 ( 9 Check My Work A+ My J Apr 5 5:24 0 I O P { [ h J k 1 X C V b n M alt ctrl ? G backspace 1 enter shi