Question: a, b, and c ? (27 points) You work in a marketing agency, and you are calculating the effect of spending on ads on YouTube
a, b, and c ?

(27 points) You work in a marketing agency, and you are calculating the effect of spending on ads on YouTube on total sales. The dataset marketing has 200 observations. Each observation is the weekly spending on ads on You'I'ube and the sales of your products. Note: the sales (sales) are measured in thousands of dollars, while spending on ads on YouTube (youtube) is measured in dollars. > regression summary(regression) Call: 1m(formula = sales \" youtube, data = marketing) Residuals : Min 10 Median SQ Max -10.0532 -2.3454 -0.2295 2.4805 8.6548 Coefficients: Estimate Std. Error 1: value Pr(>|t|) (Intercept) 8.439112 0.549412 15.35
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