Hi, I was really struggling with these practice test questions, is someone able to help show how to arrive at the correct conclusions?

Question 20

In a regression and correlation analysis if r2 = 1 then…

Question 21

In a residual plot that does not suggest we should challenge the assumptions of our regression model, we would expect to see…

Question 22

SSTR =6750H0: u1 = u2 = u3 = u4

SSE = 8000Ha: at least one mean Is different

nT = 20

at alpha = .05, the null hypothesis

Question 23

The following estimated regression model was developed relating yearly income (y in $1,000) of 30 individuals with their age (X1) and their gender (X2) ( 0 if male and 1 if female)

Y hat = 30 + 0.7X1 + 3X2

Also provided are SST = 1,200 and SSE = 384.

The yearly income of a 24-year-old female individual is…