A scatterplot shows the relationship between hours studied (x) and test score (y). The line of best fit is y = 4.2x + 52. What does the slope 4.2 represent?
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A
For each additional hour studied, the predicted test score increases by 4.2 points
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B
A student who studies 0 hours is predicted to score 4.2 points
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C
The average test score is 4.2 points
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D
For each additional test point, hours studied increase by 4.2