8. A lawn and garden centre intends to use sales of lawn fertilizer to predict lawn mower sales. The store manager wishes to determine the relationship between fertilizer and mower sales. The pertinent data are: a. Determine the correlation between the two variables. Does it appear that a relationship between these variables will yield good predictions? Explain. (You may use Excel's "=CORREL (RangeY,RangeX)" to determine r, where RangeY is the range of Excel cells containing the y values and RangeX is the range of Excel cells containing the x values. You also need R2, RSQ(RangeY,RangeX).) b. Obtain a linear regression line for the data. (You may use Excel's "=slope(RangeY,RangeX)" and "=intercept(RangeY,RangeX)" to obtain the regression coefficients b and a, respectively. Alternatively, use Trendline in the Layout menu.) c. Predict lawn mower sales, given fertilizer sales of 2 tonnes