Find the correlation coefficient, r, of the data described below.
The owner of Grizzly Tea Shack is thinking about adding iced tea to the menu. She thinks she can do this with minimal effort by adding ice cubes to cups of hot tea. She decides to measure how changing the number of ice cubes in a glass of freshly brewed tea affects its cooling rate.
To begin, the owner varies the number of ice cubes, x, she puts in glasses of freshly brewed tea. She then checks the temperature (in Celsius), y, of each glass after 10 minutes.
Ice cubes Temperature after 10 minutes (in degrees Celsius)
2 17
2 18
3 19
3 20
6 6
Round your answer to the nearest thousandth.
r=