The data from data354.dat contains information on 78 seventh-grade students. we

Question

The data from data354.dat contains information on 78 seventh-grade students. we want to know how well each of IQ score and self-concept score predicts GPA using least-squares regression. we also want to know which of these explanatory variables predicts GPA better. Give numerical measures that answer these questions. (Round your answers to three decimal places.) (Regressor: IQ)R^2 107.5 (Regressor: Self-Concept)R^2 56.295 Which variable is the better predictor? IQ Self Concept A study of class attendance and grades among first-year students at a state University showed that in general students who attended a higher percent of their classes earned higher grade. Class attendance explained 81% of the variation in grade index among the students. What is the numerical value of the correlation between percent of classes attended and grade index? ___________

Explanation / Answer

SOlution2:

Correlation coefficient is denoted by R

given r sq=0.81

r=sqrt(0.81)

=0.9

correaltion coefficent =0.9

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