To compare the means of two randomly assigned groups of individuals, the appropriate test is:

To compare the means of two randomly assigned groups of individuals, the appropriate test is:
 
  a. a t-test for dependent groups.
  b. a t-test for matched scores.
  c. a t-test for independent groups.
  d. any one of these

Question 2

Characteristics of a population are referred to as ____ whereas characteristics of a simple sample are referred to as ____.
 
  a. statistics; parameters
  b. parameters; statistics
  c. parameters; probabilities
  d. probabilities; parameters

Question 3

Using inferential statistics, we test hypotheses about:
 
  a. the population.
  b. the sample.
  c. the relation between the samples.
  d. all of these

Question 4

In general, the null hypothesis means that:
 
  a. subjects were randomly assigned to groups.
  b. a confounding variable is responsible for differences between subject groups.
  c. subject groups came from the same population.
  d. there is a significant difference between subject groups.