The Spearman-Brown prophecy formula should not be used unless the correlation has been obtained on ...

The Spearman-Brown prophecy formula should not be used unless the
  correlation has been obtained on the basis of the
 
  a. test-retest technique
  b. alternate forms technique
  c. predictive validity technique
  d. split-half technique

Question 2

The value of the standard error of estimate may never be less than
 
  a. 1.00
  b. 0
  c. the mean of Y
  d. the standard deviation of Y

Question 3

Whenever Ho is rejected, then
 
  a. it is possible to commit the Type 1 error
  b. it is impossible to commit the Type 1 error
  c. the only possible error is sampling error
  d. none of these