A researcher wishes to test the idea that shoe size and mathematical ability are correlated;,that is, people with larger feet have higher mathematical skills. To test this he conducts astudy of an entire town of 2000 persons measuring their shoe size and administering a mathtest. He finds that there is a significant correlation between shoe size and math skills withpeople with larger feet having higher math skills.(a) What might an important problem with this approach?)(b) The researcher decides to use data only for adults ages 21 to 60 to compute acorrelation coefficient. What value of r should he expect?

The problem is the "entire town." This includes infants, children, as well as adults. Clearly small…

Answered: À researcher wishes to test the idea…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The accompanying technology output was obtained by using the paired data consisting of foot lengths (cm) and heights (cm) of a sample of 40 people. Along with the paired sample data, the technologgy was also given a foot length of 10.8 cm to be used for predicting height. The technology found that there is a linear correlation between height and foot length. If someone has a foot length of 10.8 cm, what is the single value that is the best predicted height for that person? H Click the icon to view the technology output. The single value that is the best predicted height is cm. Technology Output (Round to the nearest whole number as needed.) The regression equation is Height - 67.5 +5.15 Foot Length Predictor Coef SE Coef Constant 67.52 11.07 6.10 0.000 Foot Length 5.1508 0.4817 10.69 0.000 S-5.50271 R-Sq = 73.18 R-Sq (adj) = 72.44 Predicted Values for New Observations New Obs Fit SE Fit 95 CI 954 PI 123.149 1.605 (119.732, 126.566) (111.996, 134.302) Values of Predictors for New…
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