Which action would increase the control of an experimental study? ...

[Metfan725]

Which action would increase the control of an experimental study?
 
  a. Establishing strict criteria for subject selection
  b. Allowing participants to decide whether or not to be in the experimental group
  c. Ensuring that subjects do not know the purpose of the experimental study
  d. Increasing the number of assistants involved in data collection

Question 2

In which way is the independent variable handled differently in a study with a true experimental design compared with a study with a quasi-experimental design?
 
  a. An experimental design requires an independent variable, whereas a quasi-experimental design neither identifies nor requires an independent variable.
  b. Although both designs identify an independent variable, the nature of the groups (randomized versus nonrandomized) means that manipulation may result in different results.
  c. Experimental designs demonstrate that the independent variable is related to the outcome, and quasi-experimental studies allow for independent variables that stand alone.
  d. Although both designs identify an independent variable, experimental designs identify it before the research is initiated, whereas quasi-experimental designs identify it after the data are analyzed.

[ansleighelindsey]

Answer to Question 1

ANS: A

Feedback
A Strict subject selection criteria help to minimize bias and limit extraneous variables.
B Self-selection for the treatment group would be likely to decrease control, increase bias, and limit the validity of study outcomes.
C Subjects are entitled to know the purpose of a study via informed consent.
D Increasing the number of research assistants to collect data can decrease control if they are not specially trained.

Answer to Question 2

ANS: B

Feedback
A A quasi-experimental design includes both dependent and independent variables.
B The major difference between experimental and quasi-experimental designs is the randomization of groups. Independent variables are manipulated in both designs.
C Both experimental and quasi-experimental designs examine the relationship of dependent and independent variables.
D In both experimental and quasi-experimental designs, variables are identified before the study begins.

[Metfan725]

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[ansleighelindsey]

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