Ch. 10:

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 3139.7, and the average expenditure in a sample survey of 38 female consumers was $65.13. 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 $12. The 2 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 99% condence, what is the margin of error? c. Develop a 99% condence interval for the difference between the two population means. to The National Association of Home Builders provided data on the cost of the most popular home remodeling projects. Sample data on cost in thousands of dollars for two types of remodeling projects are as follows. Excel File: data 1041.x|sx Kitchen Master Kitchen Master Bedroom Bedroom 25.2 18.0 23.0 17.8 17.4 22.9 19.7 24.6 22.8 26.4 16.9 21.0 21.9 24.8 21.8 19.7 26.9 23.6 3. Develop a point estimate of the difference between the population mean remodeling costs of kitchens and master bedrooms. (Enter negative values as negative numbers. Report in thousands of dollars with no commas in your answer.) Point estimate = 3 thousand b. Develop a 90% condence interval for the difference between the two population means. (to 1 decimal and enter negative values as negative numbers) ( , ) in thousands of dollars. Each year, over 2 million people in the United States become infected with bacteria that are resistant to antibiotics. In particular, the Centers of Disease Control and Prevention has launched studies of drug-resistant gonorrhea (CDC.gov website). Of 142 cases tested in Alabama, 9 were found to be drug-resistant. Of 268 cases tested in Texas, 5 were found to be drug-resistant. Do these data suggest a statistically signicant difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance. What is the p-value, and what is your conclusion? Test statistic = 0 (to 2 decimals) pvalue = 0 {to 4 decimals) Conclusion: Reject the null hypothesis : 69 Choose the correct option. There is a signicant difference in drug resistance between the two states. Alabama has the higher drug resistance rate. True : GO