When a subject variable is used as an IV, it is

When a subject variable is used as an IV, it is
 
  a. manipulated.
  b. assigned after the fact.
  c. an obvious causal variable.
  d. all of these.

Question 2

The slope of the regression line
 
  a. may never be negative
  b. may never be greater than +1.00
  c. may never be greater than the correlation value
  d. none of these

Question 3

Degrees of freedom for Pearson's r can be calculated using
 
  a. N-1, where N is the number of values in the data set.
  b. N-1, where N is the number of pairs of values in the data set.
  c. N-2, where N is the number of values in the data set.
  d. N-2, where N is the number of pairs of values in the data set.

Question 4

In regression analysis, when Y increases by two units for each equal single-unit increase in X, then
 
  a. the intercept equals +2.00
  b. the intercept equals +.50
  c. the slope equals +2.00
  d. the slope equals +.50