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  3. table 2.5 (page 109) gives data on the true calori

Table 2.5 (page 109) gives data on the true calories in 10 foods and the average...

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Statistics

Table 2.5 (page 109) gives data on the true calories in 10 foodsand the average guesses made by a large group of people. Exercise2.26 explored the influence of two outlying observations on thecorrelation.

(a) Make a scatterplot suitable for predicting guessed caloriesfrom true calories. Circle the points for spaghetti and snack cakeon your plot. These points lie outside the linear pattern of theother 8 points.

(b) Find the least-squares regression line of guessed calorieson true calories. Do this twice, first for all 10 data points andthen leaving out spaghetti and snack cake.

(c) Plot both lines on your graph. (Make one dashed so you cantell them apart.) Are spaghetti and snack cake, taken together,influential observations? Explain your answer.

Table 2.5

Guessed

Correct

Food

calories

calories

8 oz. whole milk

196

159

5 oz. spaghetti with tomato sauce

394

163

5 oz. macaroni with cheese

350

269

One slice wheat bread

117

61

One slice white bread

136

76

2-oz. candy bar

364

260

Saltine cracker

74

12

Medium-size apple

107

80

Medium-size potato

160

88

Cream-filled snack cake

419

160

Answer & Explanation Solved by verified expert
3.8 Ratings (712 Votes)
afrom Scatter plot we can see that two circled observations areoutliers which    See Answer
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