An experimenter hypothesizes that biology majors score higher than literature majors on an ...

An experimenter hypothesizes that biology majors score higher than literature majors on an intelligence test. If the mean score for biology majors was 18.8 and the mean score for literature majors was 21.3, and the Sdifference was 0.9, the t score was
 
  A) t = (18.8  21.3) / 0.92 = 3.09
  B) t = (18.8  21.3) / 0.9 = 2.78
  C) t = (18.8  21.3) (0.9) = 2.25
  D) t = (18.8  21.3) / (2) (0.9) = 1.39

Question 2

For the t ratio, when the null hypothesis is rejected, then
 
  a. the difference is assumed to be significant
  b. the difference is assumed to equal zero
  c. the difference is assumed to be positive
  d. none of these

Question 3

Predict a Y value for a known X value 1100.00.
 
  What will be an ideal response?