If a researcher reported for a single-sample t test that t(10) = 2.50, p < .05, how many subjects ...

If a researcher reported for a single-sample t test that t(10) = 2.50, p < .05, how many subjects were there in the study?
 
  a. 10
  b. 9
  c. 11
  d. 12

Question 2

If a researcher reported for a single-sample t test that t(17) = 2.90, p < .02, how many subjects were there in the study?
 
  a. 18
  b. 20
  c. 10
  d. 9

Question 3

In a study with 16 subjects and s = 10, the estimated standard error of the mean would be:
 
  a. 1.0.
  b. 1.5.
  c. 2.0.
  d. 2.5.

Question 4

In a study with 25 subjects and s = 15, the estimated standard error of the mean would be:
 
  a. 0.6.
  b. 3.0.
  c. 2.0.
  d. 2.6.