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You Are Given the Following Pairs of Scores on X XY657482877082465355697581\begin{array}{cc}\hline X & Y \\\hline 65 & 74 \\82 & 87 \\70 & 82 \\46 & 53 \\55 & 69 \\75 & 81 \\\hline\end{array}

Question 21

Essay

You are given the following pairs of scores on X (Pretest score) and Y (Posttest score).
XY657482877082465355697581\begin{array}{cc}\hline X & Y \\\hline 65 & 74 \\82 & 87 \\70 & 82 \\46 & 53 \\55 & 69 \\75 & 81 \\\hline\end{array}
a. Find the linear regression model for predicting Y from X.
b. Use the prediction model obtained to predict the value of Y for a new person who scored 80 on the pretest.

Correct Answer:

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(a) Intercept a = 15.919, slope b = .892...

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