A scatterplot's line of best fit has slope 4. The x-axis is hours studied, the y-axis is exam marks. The slope means:
AStudying 4 hours guarantees the maximum marks
BThe minimum exam marks for any student were 4
COn average a student gains 4 hours per mark
DEach extra study hour predicts a 4-mark rise
Answer & Solution
Correct answer: D. Each extra study hour predicts a 4-mark rise
Slope of a best-fit line = predicted change in y per unit increase in x. With y = exam marks and x = hours, slope 4 means each additional hour predicts a 4-mark rise on average.
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