The average expenditure on valentine's day was expected to be (usa today, february 13, 2006). do male and female consumers differ in the amounts they spend? the average expenditure in a sample survey of male consumers was , and the average expenditure in a sample survey of female consumers was . based on past surveys, the standard deviation for male consumers is assumed to be , and the standard deviation for female consumers is assumed to be . the value is . round your answers to 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?