Alek JohnsonA02275958Stats HW 52.78a)b)c)2.79a)y= -0.126 + 0.061xb)y= -0.126 + 0.061x= -0.126 + 0.061(2.0)y= -.004Up and over method shows that 2.0 social distress is about 0 brain activity.
c) r = 0.878r^2 = .77077% of the variance in brain activity can be explained by changes in social distress.2.80y = -2.3947712 + 0.15848297x is the rate at which icicles grow in cm/min for group 8903. y = -1.4532609 + 0.091126087x is the rate at which icicles grow in cm/min for group 8905.Flow rate affects growth tremendously. The growth rates are .158x and .091x. The faster the water flows, the more slowly the icicles grow.2.81 Run 8903 x is time y is lengthMean Time= 95S.D. Time= 53.39Mean of Lengths= 12.661S.D. Lengths = 8.497Correlation = 0.996y=b0 + b1xb1=r(sy/sx)=.996 (8.497/53.39) = .158b0= y - b1x=12.611-.158(95) = -2.399y= -2.399 + .158x This matches the previous problems equation.Run 8903Mean Time= 95S.D. Time= 53.39Mean of Lengths= 12.661S.D. Lengths = 8.497Correlation = 0.996x=b0 + b1yb1=r(sx/sy)=.996 (53.39/8.497) = 6.258b0= y - b1x=95 - 6.258(12.661) = 15.767x= 15.767 + 6.258yThe units that each of these slopes has is cm/min for predicting length from time and min/cm forpredicting time from length.