So the following is the answer of the following question in your problem and please do not post to many question in just one posting.
#1 The 98% confidence interval for the mean hours is between 6 and 50.
#2 The smallest margin of error between the two is southern florida with 1.8% margin of error.
To simplify the problem it would be: -18xy+18y^2
The value of the four in 3.954 is 0.004, or 4 thousandths.
