In studies of prison riots, it has been found that prison riots increase as security measures are ...

In studies of prison riots, it has been found that prison riots increase as security measures are heightened (Useem & Kimball,1989). In these studies the independent variable is the heightened security.
 
  Indicate whether the statement is true or false

Question 2

Correlating test scores with an independent measure of the trait being
  measured provides an estimate of the test's validity.
 
  Indicate whether the statement is true or false

Question 3

The regression of Y on X is used to predict X, given information on a third variable.
 
  Indicate whether the statement is true or false

Question 4

The standard error of the mean may never be negative.
 
  Indicate whether the statement is true or false