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 54 male consumers was 133.32 , and the average expenditure in a sample survey of 30 female consumers was 61.4. Based on past surveys, the standard deviation for male consumers is assumed to be 31, and the standard deviation for female consumers is assumed to be 10. 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. to
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 54 male consumers was 133.32 , and the average expenditure in a sample survey of 30 female consumers was 61.4. Based on past surveys, the standard deviation for male consumers is assumed to be 31, and the standard deviation for female consumers is assumed to be 10. 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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