A transportation worker takes a simple random sample of 162 toll booth receipts for one day and finds that the mean is $7.38 with a standard deviation of $1.45. What is the 99% confidence interval for the mean amount of all the receipts that day?
(Points : 4)
($7.30, $7.46)

($7.27, $7.49)

($7.16, $7.60)

($7.09, $7.67)

Question

A transportation worker takes a simple random sample of 162 toll booth receipts for one day and finds that the mean is $7.38 with a standard deviation of $1.45. What is the 99% confidence interval for the mean amount of all the receipts that day?
(Points : 4)
       ($7.30, $7.46)

       ($7.27, $7.49)

       ($7.16, $7.60)

       ($7.09, $7.67)

anonymous · Answer

Question 3.3. In a random sample of 63 women at a company, the mean salary is $48,902 with a standard deviation of $5270. In a random sample of 50 men at the company, the mean salary is $53,454 with a standard deviation of $4677. Construct a 95% confidence interval for the difference between the mean salaries of all women and men at the company.
(Points : 4)
       ($2134.05, $6969.95)

       ($2715.11, $6388.89)

       ($3614.81, $5489.19)

       ($4083.40, $5020.60)

anonymous · Answer

@ribhu @gerryliyana