Using your own height and the appropriate regression equation from Exercise 10.19 or 10.20, predict your own weight. (If you are uncomfortable reporting your own weight, predict mine—

I am 5980 and weigh 156 pounds—well, at least I would like to think so.)

a) How much is your actual weight greater than or less than your predicted weight? (You have just calculated a residual.)

b) What effect will biased reporting on the part of the students who produced the data play in your prediction of your own weight?

Exercise 10.20

The following data are the actual heights and weights referred to in Chapter 9 of female college students:

a) Make a scatterplot of the data.

b) Calculate the regression coefficients for these data. Interpret the slope and the intercept.

c) What is the correlation coefficient for these data?

d) Are the correlation and the slope significantly different from zero?

Transcribed Image Text:

Height Weight Height Weight 61 140 65 135 66 120 66 125 68 130 65 118 68 138 65 122 63 121 65 115 70 125 64 102 68 116 67 115 69 145 69 150 69 150 68 110 67 150 63 116 68 125 62 108 66 130 63 95 65.5 120 64 125 66 130 68 133 62 131 62 110 62 120 61.75 108 63 118 62.75 112 67 125