Analysts at The Home Depot want to predict quarterly sales from housing and find the correlation is 0.70. They then examine the scatterplot and decide it is appropriate to fit a regression model to predict Sales ($ billion) from Housing Starts (in thousands).

a) What units does the slope have?

b) What is the R² value for the model?

c) What would you predict about the Sales for a quarter that has housing starts one standard deviation below average in Housing Starts?