When conducting case studies, it is often difficult for the ...

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When conducting case studies, it is often difficult for the researcher to control for __________.
 
  a. observer bias.
  b. extraneous variables.
  c. both a and b
  d. neither a nor b

Question 2

Suppose a researcher is designing a study and has reason to believe that the relationship between the independent and dependent variables follows an inverted-U pattern.
 
  In choosing levels of the independent variable, the researcher should probably choose
 
   a. one level that represents the predicted high point of the pattern.
   b. one level that represents the predicted average of the pattern.
   c. two levels that represent the predicted high and low points of the pattern.
   d. three levels that represent the predicted high, medium, and low points of the pattern.

[paavo]

Answer to Question 1

c

Answer to Question 2

d