Water Consumption Lift-Off Minus 1 Return Plus 1 Return Plus 1 Month D Rat 1 18.4 32 31 Rat 2 17.4 17 34 Rat 3 27.8 30 39 Rat 4 27.9 29 44 Rat 5 30.6 47 55 Rat 6 22.4 24 33 Researchers wanted to determine the effects of space flight on a rat's daily consumption of water. The data in the accompanying table represent the water consumption (in milliliters per day) at lift-off minus 1, return plus 1, and 1 month after return for six rats sent to space. Complete parts (a) through (d) below. Click the icon to view the data table. . . . (a) What is the response variable in this study? What is the treatment? How many levels does it have? The response variable is the water consumption. The treatment is space flight which has 3 levels. (b) Normal probability plots for each treatment indicate that the requirement of normality is satisfied. Verify that the requirement of equal population variances for each treatment is satisfied. Since is less than twice , the requirement of equal population variances for each treatment is satisfied. (Round to two decimal places as needed.)