I did every part of the question but i'm confused on how to do question 7? Any help would be appreciated !

A researcher collects data on the relationship between the amount of daily exercise an individual gets and the percent body fat of the individual. The following scores are recorded.

Individual

1

2

3

4

5

Exercise (min)

10

18

26

33

44

% Fat

30

25

18

17

14

1. Pearson r-0.959

And

2.Regression equation

Y'= -0.476x + 33.272

3.What is the least squares regression equation for using Exercise time to predict %body fat. Y'= -0.476x + 33.272

4.What percent of the variance in %body fat can we account for by knowledge of exercise time? 0.919

5.What is the slope of the regression line?-0.476

6.What is the 95%confidence interval for the regression slope?8.113682825

7.When testing the null hypothesis for the regression coefficient that H₀: b=0, what is the t ration used?

8.What does the slope in the regression line above mean

The more daily exercise an individual gets, the less % of body fat they have.

9.What number reflects the error in prediction 2.14