The table for part a shows approximate distances between selected cities and the approximate cost of flights between those cities in November 2009.

a. Calculate the correlation of the numbers shown in the part a table by using a computer or statistical calculator.

Cost Miles

180 ....... 960

400 .......3100

270 .......2000

100 ....... 430

443 .......3000

b. The table for part b shows the same information, except that the distance was converted to kilometers by multiplying the number of miles by 1.609. What happens to the correlation when numbers are multiplied by a constant?

Cost Kilometers

180 .......1545

400 .......4988

270.......3218

100....... 692

443.......4827

c. Suppose the Federal Aviation Administration (FAA) adds a tax to each flight. Fifty dollars is added to every flight, no matter how long it is

The table for part c shows the new data. What happens to the correlation when a constant is added to each number?

Cost Miles

230 ....... 960

450 .......3100

320 .......2000

150 ....... 430

493 .......3000