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In a scatterplot of (hours studied, exam score), a line of best fit has slope 7. What does the slope mean in context?
AThe base exam score is 7 marks total
BStudying 7 hours guarantees the best score
COn average a student gains 7 hours per mark
DAn extra hour studied predicts a 7-mark rise
Answer & Solution
Correct answer: D. An extra hour studied predicts a 7-mark rise
Slope of a best-fit line = predicted change in $y$ per unit increase in $x$. With $y$ as exam score and $x$ as hours, slope 7 means each extra study hour predicts a 7-mark rise on average.
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