Laptops and Learning In Exercise1.61 we described an informal experiment conductedat

Chapter 12, Problem 28

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Laptops and Learning In Exercise1.61 we described an informal experiment conductedat McNair Academic High School in JerseyCity, New Jersey. Two freshman algebra classes werestudied, one of which used laptop computers at schooland at home, while the other class did not. In eachclass, students were given a survey at the beginningand end of the semester, measuring his or her technologicallevel. The scores were recorded for the end ofsemester survey (x) and the final examination (y) forthe laptop group.5 The data and the MINITAB printoutare shown here.Final FinalStudent Posttest Exam Student Posttest Exam1 100 98 11 88 842 96 97 12 92 933 88 88 13 68 574 100 100 14 84 845 100 100 15 84 816 96 78 16 88 837 80 68 17 72 848 68 47 18 88 939 92 90 19 72 5710 96 94 20 88 83 MINITAB output for Exercise 12.28Regression Analysis: y versus xThe regression equation isy = -26.8 + 1.26 xPredictor Coef SE Coef T PConstant -26.82 14.76 -1.82 0.086x 1.2617 0.1685 7.49 0.000S = 7.61912 R-Sq = 75.7% R-Sq(adj) = 74.3%Analysis of VarianceSource DF SS MS F PRegression 1 3254.0 3254.0 56.05 0.000Residual Error 18 1044.9 58.1Total 19 4299.0a. Construct a scatterplot for the data. Does theassumption of linearity appear to be reasonable?b. What is the equation of the regression line used forpredicting final exam score as a function of theposttest score?c. Do the data present sufficient evidence to indicatethat final exam score is linearly related to theposttest score? Use a .01.d. Find a 99% confidence interval for the slope of theregression line