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Mathematics 9 Online
OpenStudy (tullashlee):

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

KjSaif (kjsaif):

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