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Consider a simple linear regression relating y exam score

Consider a simple linear regression relating y = exam score (ranging from 0 to 100 points) to x = amount (in dollars) paid for a tutor for a sample of n=100 college business students who all paid tutors to prepare for the exam. The results are: estimated slope=2, R2=.30, s=10, and r=.55. What proportion of the sample variation in exam scores can be explained by the model?

30%
2%
10%
55%

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Basic Statistics: Consider a simple linear regression relating y exam score

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