The slope of the trend line is 15. What does that mean in regard to the data of the scatterplot? Check all that apply.

Slope describes the rate of change between the two variables. With a slope of 15, sales increase by $15,000 for each $1,000 increase in advertising costs, so C gives the direction and amounts correctly. Because the slope is positive, the data show a positive correlation; a positive slope does not indicate a negative correlation.

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