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The 90 million Americans of age 50 and over control 50 percent of all discretionary income....

The 90 million Americans of age 50 and over control 50 percent of all discretionary income. AARP estimates that the average annual expenditure on restaurants and carryout food was $1,876 for individuals in this age group. Suppose this estimate is based on a sample of 75 persons and that the sample standard deviation is $570 . Round your answers to the nearest whole numbers.

a. At 95% confidence, what is the margin of error?

b. What is the 95% confidence interval for the population mean amount spent on restaurants and carryout food?

( , )

c. What is your estimate of the total amount spent by Americans of age 50 and over on restaurants and carryout food?

$___million

math   Statistics-And-Probability   
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