please see the attached file.

1. If the alpha level is set at 0.01, then what is the result of likelihood of a significant result occuring, due to mere chance?
1%

2. Four pairs of data yield r = 0.942 and the
Regression equation =3x.

Also, y-bar =12.75.
What is the best predicted value of y for x=2.6?

Regression equation y = 3x, therefore for x = 2.6, best predicted value of y = 2.6 * 3 = 7.8

3. what should be used as a sample of N =45...a z-test or t-test??

If sample size is more than 30, then z-test should be used