Experimental Design in Research Methodology

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Questions and Answers

What is the primary purpose of randomization in an experimental design?

  • To reduce the number of observations
  • To increase the sample size of the experimental group
  • To eliminate the effects of extraneous variables (correct)
  • To ensure that the treatment is effective

Which experimental design lacks a control group?

  • True experimental design
  • Randomized controlled trial
  • One-shot case study (correct)
  • Quasi-experimental design

What is the independent variable in an experiment?

  • The variable being measured or observed
  • The variable being controlled
  • The variable being predicted
  • The variable being manipulated or changed (correct)

What is the purpose of a pretest in an experiment?

<p>To establish a baseline measurement of the dependent variable (D)</p> Signup and view all the answers

Which type of experimental design has a high degree of controlling extraneous variables?

<p>True experimental design (C)</p> Signup and view all the answers

What is the dependent variable in an experiment?

<p>The variable being measured or observed (B)</p> Signup and view all the answers

What is the main limitation of the one-group pretest-posttest design?

<p>No proper selection is made (D)</p> Signup and view all the answers

What is the primary purpose of comparing pretest and posttest results in the one-group pretest-posttest design?

<p>To determine the treatment's effect (B)</p> Signup and view all the answers

What is the key characteristic that distinguishes quasi-experimental designs from true experimental designs?

<p>No randomization is required (D)</p> Signup and view all the answers

What is the purpose of random selection in experimental design?

<p>To randomly assign subjects to groups (D)</p> Signup and view all the answers

In a static-group comparison design, what is compared to determine the treatment's effect?

<p>Posttest results of the experimental and control groups (B)</p> Signup and view all the answers

What is the main difference between a non-equivalent control group design and a pretest-posttest control group design?

<p>No randomization is required in the non-equivalent control group design (B)</p> Signup and view all the answers

What is the major drawback of the quasi-experimental design?

<p>Presence of extraneous variables (D)</p> Signup and view all the answers

In a true experimental design, how are subjects assigned to groups?

<p>Through random assignment (D)</p> Signup and view all the answers

What is the purpose of a control group in an experimental design?

<p>To compare the results of the experiment with a similar group (B)</p> Signup and view all the answers

What is the dependent variable in an experiment?

<p>The variable being measured or observed (A)</p> Signup and view all the answers

What is the key difference between a one-group pretest-posttest design and a time-series design?

<p>Number of times the subjects are pretested and post-tested (A)</p> Signup and view all the answers

In a posttest-only control group design, when is the dependent variable measured?

<p>Only once, after the treatment (B)</p> Signup and view all the answers

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