If a researcher reported for a correlated-groups t test that t(18) = 2.90, p < .01, how many ...

If a researcher reported for a correlated-groups t test that t(18) = 2.90, p < .01, how many subjects were there in the study?
 
  a. 18
  b. 20
  c. 17
  d. 19

Question 2

If the null hypothesis is not supported, then the t test should be:
 
  a. 0.00.
  b. 1.00.
  c. greater than 1.00.
  d. a negative number.

Question 3

After calculating a correlated-groups t test, if you find that it is equal to zero, then:
 
  a. the two means differ significantly.
  b. the two means do not differ significantly.
  c. there is something wrong in the calculation.
  d. none of the above are accurate.