Question

The table and graph below relates the amount of coffee that the average American consumed with the number of people in the US killed by misusing a lawnmower for each year from 2000 to 2009. (Source Gallons of coffee 421 387 Lawnmower deaths 27 45 378 53 Year 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 61 388 395 388 391 393 57 388 59 43 84 373 Lawnmower Deaths and Coffee Consumption Deaths (US) 380 380 30 390 Gallons of corte 400 Gallons of coffee 410 420 a) The direction of the correlation is negative. b) The correlation between lawnmower deaths and coffee consumption by the average American is likely explained by coincidence. c) 51.4% of the variation in the number of lawnmower deaths can be explained by the amount of coffee consumption by the average American (R2 = .514). What is the value of the correlation coefficient?

Answer 1

We have here,

R? = 0.514

Correlation coefficient

= +V0.514

  

= +0.717

c) Correlation coefficient =-0.717..............................Since direction of correlation is  negative.