Help with model prediction and MatLab 4. It is difficult to determine a person\'

Question

Help with model prediction and MatLab

4. It is difficult to determine a person's body fat percentage accurately without immersing him or her in water. Researchers hopping to find ways to make a good estimate of body fat percentage without immersion techniques immersed 20 male subjects then measured their waists and recorded their weights, a. Create a model to predict Body Fat from a near combination of Weight, Waist, and an offset b. Interpret the slopes of your model. c. is your model likely to make reliable estimates? Explain d. What is the model residual for subject 4 (33 in waist and 159 lb)? e. What is the model prediction for body fat of a person with a 40 in waist and weighing 170 lb?

Explanation / Answer

a) the fitted model is,

bodyfat=-61.2455-0.0708*weight+2.5410*waist

b)From the above equation we may interprete as as weight increases bodyfat decreasea or vice versa and as waist incrases bodyfat increases or as waist decreases bodyfat decreases.

d) -5.3510211

e)28.3585 (approximately 28)

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