Find the correlation coefficient, r, of the data described below.
Last week, a political campaign aired a new TV ad promoting its candidate. The ad was aired a different number of times depending on the region. To decide how many times to air the ad next week, the campaign manager looked at the impact the ad had made in the different regions.
He tracked the number of times the ad had run in each region, x, and the increase of the candidate's approval rating in those regions, y.
Ads run Approval rating increase
6 18
8 8
13 15
13 9
17 17
Round your answer to the nearest thousandth.
r=