Lock, Statistics Unlocking the Power ef Data, 2 Predicting Percent Body Fat This

Question

Lock, Statistics Unlocking the Power ef Data, 2 Predicting Percent Body Fat This problem uses the dataset Bodyf at, which glives the percent of weight made up of body fat for 100 men as well as other varlables such as Age, Weighe Oin pounds), Meight (in inches), and droumference (in am) measurements for the Neck, Chest, Abdomen, Ankle, Biceps, and Wrist Using Abdomen Circumference to Predict Body Fat Figure 1 shows the data and regression e for using weight to predict body fat percentage Figure 2 shows the data and regression line for using abdomen droumference to predict bedy fat percentage 30 10 120 140 160 180 220 210 200 280 90 100 110 120 130 Figure 1 Uaing weght to preit percene body far Figure 2 Using abdomen to predict percent bedy t 6 0

Explanation / Answer

a) Abdomen

(The points are closer to regression the line for abdomen than for weight)

b) Observed body fat = 34%

Predicted body fat = 40%

c) Abdomen circumferance = 125

Residual = 125 - 115 = 10 cm

= (10/125)x100 = 8%

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