Data were collected on the amount spent by 64 customers for lunch at a major houston restaurant. these data are contained in the file named houston. based upon past studies the population standard deviation is known with σ = $6.a. at 99% confidence, what is the margin of error? b. develop a 99% confidence interval estimate of the mean amount spent for lunch.

Which data set has a greater spread? why? set a: {38, 12, 23, 48, 55, 16, 18} set b: {44, 13, 24, 12, 56} has a greater spread because .

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?