Banana meal diet for fish. Refer to the Aquaculture Reports (Vol. 17, 2020) study of a new banana meal diet for fish native to tropical South America, Exercise 11.20 (p. 658) Recall that the new diet with various amounts of banana meal was fed to each in a sample of 80 juvenile tambaqui. The researchers fit a simple linear regression model with weight gain (y, grams) as the dependent variable and amount of whole banana meal (x, percentage) in diet as the independent variable.

a. Set up the null and alternative hypothesis for a test for a negative slope.

b. The test resulted in p@value 6 .05. Interpret this result practically.