Increasing sample size will (Multiple Choice)

Increasing sample size will
 
  a. enhance the credibility of ex post facto research.
  b. lessen the credibility of ex post facto research.
  c. not change the credibility.

Ques. 2

An internal validity threat in which the researcher's expectations concerning the outcome of an experiment actually contribute to producing certain outcomes is known as the ____ effect.
 
  a. Hawthorne
  b. John Henry
  c. Diffusion
  d. Pygmalion
  e. Experimenter effect

Ques. 3

In an ex post facto study, a researcher investigated the effect of academic self-concept on school achievement. He concluded that a more positive self-concept leads to higher achievement in school. Label the following plausible alternative hypotheses as common cause, reverse causality, or other independent variables may be operating. Teachers are impressed by students with positive self-concept and tend to overrate their achievement.
 
  a. common cause
  b. reverse causality
  c. other independent variables may be operating