Question

The table presents Ray's monthly electricity bills and the amount of time Ray spent at home from January through August.

Month Time Spent at
Home (hours) Electricity
Bill ($)
January 240 128
February 225 126
March 212 115
April 264 144
May 282 146
June 198 108
July 234 142
August 254 142
Using the scatter plot tool, find the correlation coefficient of this data set.

The correlation coefficient (r) is
.

The correlation coefficient can be improved by ignoring the bill for the month of

Answer 1

afaik there's no easy way to do this besides plugging the values into a calculator

http://www.socscistatistics.com/tests/pearson/Default2.aspx