13.42 [EX13-42] Nationwide, hailstones cause about $1 billion in property and crop damage each year, according to the April 25, 2005, USA Today Weather Focus report “Violent storms create the largest hail.” The speed of a thunderstorm’s updraft is one of the factors affecting the size (diameter)

of a hailstone. The following data were given in the article.

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X, wind updraft speed (mph) 22 37 56 100 y, hailstone size (inches) 0.5 0.75 1.75 3.0 Refer to the following computer output and verify that the equation of the line of best fit is = -0.289 +0.0333x and that s = 0.1904 by cal- culating these values yourself. The regression equation is size =-0.289 +0.0333 speed Predictor Constant speed Coef -0.2889 0.033282 SE Coef T P 0.1980 -1.45 0.284 0.003249 10.24 0.009 s=0.190383 R-Sq = 98.1 % R-Sq (adj) = 97.2%