A supermarket wants to test the effect of the height of the shelf display on the monthly sales of its dairy products. Y. There are three shelf heights: bottom, X1, middle, X2, and top, X3. The estimated model is given by: Y=28.34.7X1+3.522.13 The p-value for the F-test on the joint significance of shelf height is equal to 0.161, and you... reject the null hypothesis, height helps explaining dairy sales cannot reject HO, height does not help explaining dairy sales cannot reject H0, height helps explaining dairy sales reject the null hypothesis, height does not help explaining dairy sales