Joe owns a coffee shop, and he has two measures of coffee drink quality that he has been using over the years to assess the quality of coffee drinks: 1) the grind level (in units 1, 2, 3, 4, 5), and 2) the temperature of the water pouring over the ground beans (in units 10, 20, 30, 40). Ultimately, a measure of quality is how well things sell! So, he collects sales (in 100 dollars) for a month, and comes-up with the following data. The questions are a) does grind level have predictive validity for sales? Yes/No, but also provide appropriate graphs and analysis. b) Does water temperature have predictive validity for sales? Yes/No, but also provide appropriate graphs and analysis. c) If Joe had to choose only one of the measures, which one should it be? Explain.

grid level 1 2 3 4 5 temp 10 20 30 35 40 42 20 22 29 36 38 41 30 21 31 34 39 42 40 22 32 36 40 43