Rejecting the null hypothesis when it is actually false, is a ...

[sjones]

Rejecting the null hypothesis when it is actually false, is a _____.
 
  a. Type I error c. Type II error
  b. correct decision d. incorrect decision

Question 2

In order to use the table for finding the critical values of t, you have to know which of these?
 
  a. alpha c. if it's a one- or a two-tailed test
  b. degrees of freedom d. all of these

[bob]

Answer to Question 1

B
This is a correct decision and the most desirable outcome of the 4 possibilities.

Answer to Question 2

D
You must know all of these things in order to find the critical value of t that is appropriate to your study.