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 50 male consumers was $137.28 , and the average expenditure in a sample survey of 36 female consumers was $61.47. 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 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 99% confidence, what is the margin of error? C. Develop a 99% confidence interval for the difference between the two population means.

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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 50 male consumers was $137.28 , and the average expenditure in a sample survey of 36 female consumers was $61.47. 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 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 99% confidence, what is the margin of error?

C. Develop a 99% confidence interval for the difference between the two population means.

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