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## What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females? At  confidence, 99% what is the margin of error? Develop a 99% confidence interval for the difference between the two population means. ____ to ______.

The average expenditure on Valentine’s Day was expected to be \$100.89 (USA Today, February 13, 2006). Do male and female consumers differ in the amounts they spend? The average expenditure in a sample survey of 44 male consumers was \$138.76 , and the average expenditure in a sample survey of 36 female consumers was \$61.13 . 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 \$20. The z value is 2.576.

Round your answers to 2 decimal places.

What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females?

At  confidence, 99% what is the margin of error?

Develop a 99% confidence interval for the difference between the two population means. ____ to ______.

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