1.Data were collected on the days it takes a UTD student to find a job after graduation from a random sample of 10 graduates. The sample average and the sample standard deviation are 92 and 21 days, respectively. Assume the population of interest is normally distributed. An 80% confidence interval for the average time to find a job for a UTD student is:

92 plus-or-minus 5.589

92 plus-or-minus 8.511

92 plus-or-minus 5.866

92 plus-or-minus 9.184

2.

We would like to construct a 90% confidence interval estimate of the amount spent by customers for lunch at a major Dallas restaurant. What is the minimum sample size needed to estimate this population mean with a margin of error no larger than 1 dollar? Assume the population standard deviation is 6 dollars.

43

59

60

98