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The USA Today reports that the average expenditure on Valentine's Day is $100.89. Do male and female consumers diFfer in the amounts they spend? The average expenditure in a sample survey of 44 male consumers was $135.67, and the average expenditure In a sample survey of 33 female consumers was $68.64. Based on past surveys, the standard deViation for male consumers is assumed to be $30, and the standard deVIation for fern; consumers is assumed to be $20. a. What is the point estimate ofthe difference between the population mean expenditure for males and the population mean expenditure for females (to 2 decimals]? b. At 99% condence, what is the margin of error (to 2 decimals)? c. Develop a 99% condence interval for the difference between the two population means (to 2 decimals]. Use zitable. ( , J