A small business tracks how advertising spending relates to weekly sales. ( B ) \left(B\right) Predict what the business would make in weekly sales if they spent $400 in advertising.

Welcome back. In this problem, we have a small business tracking how advertising spending relates to weekly sales. In part a, we created a scatter plot with our data, got the regression line equation, and also found the correlation coefficient. In part b, we'd like to predict what the business would make in weekly sales if they spent $400 in advertising. So we've been given an x value, and we wanna plug it into our regression line equation to get a predicted y value. I'm gonna come over here to do my work, start with an equal sign because I want Excel to run a calculation, and according to the regression line equation, we wanna take 20.587, multiply it by the x value, which in this case is 400, and then we want to add 2,015.6. We can click enter, and we end up getting the predicted y value at 10,250.4. Or in the case of this problem, we would predict that weekly sales would be $10,250.40 if $400 was spent on advertising. Great work.