Group Comparisons
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Questions and Answers

Which test is used to determine if the homogeneity of variance assumption is met?

  • Shapiro-Wilk test
  • Kruskal-Wallis test
  • Wilcoxon test
  • Levene’s test (correct)
  • What is the nonparametric equivalent of the independent samples t-test?

  • Shapiro-Wilk test
  • Levene’s test
  • Wilcoxon test (correct)
  • Kruskal-Wallis test
  • What visual method is used for testing the normality assumption?

  • Bar chart
  • Box plot
  • Histogram (correct)
  • Scatter plot
  • Which test is a generalisation of the Wilcoxon test for comparing three or more groups?

    <p>Kruskal-Wallis test</p> Signup and view all the answers

    What is the effect size reported for the Wilcoxon test?

    <p>r value</p> Signup and view all the answers

    What does the Kruskal-Wallis test indicate if the p-value is less than 0.001?

    <p>There is a significant difference in performance between the groups</p> Signup and view all the answers

    What is the main reason researchers tend to prefer parametric tests over nonparametric tests?

    <p>Parametric tests are more powerful</p> Signup and view all the answers

    What is the primary concern with unequal group sizes in statistical analysis?

    <p>It can be particularly problematic if the assumption of homogeneity of variance is violated</p> Signup and view all the answers

    What is the essential part of the analysis that makes the mean important in t-tests and ANOVA?

    <p>Central tendency of the distribution</p> Signup and view all the answers

    What statistic is used to test for normality assumption?

    <p>Shapiro-Wilk test</p> Signup and view all the answers

    What is the nonparametric equivalent of ANOVA?

    <p>Kruskal-Wallis test</p> Signup and view all the answers

    What is the primary reason nonparametric alternatives are less preferred than parametric tests?

    <p>They are less powerful</p> Signup and view all the answers

    Which statistical test is appropriate for comparing the academic performance of male and female high school students when they are in separate groups?

    <p>Independent samples t-test</p> Signup and view all the answers

    Which statistical test is suitable for comparing perfectionism ratings pre and post mindfulness intervention when participants are in both groups?

    <p>Related samples t-test</p> Signup and view all the answers

    Which statistical test is used for comparing performance on a measure of cognitive functioning among participants assigned to three different test conditions?

    <p>Univariate Analysis of Variance (ANOVA)</p> Signup and view all the answers

    What is a key assumption for both t-tests and ANOVA?

    <p>The dependent variable is normally distributed</p> Signup and view all the answers

    Which of the following is NOT an assumption for t-tests and ANOVA?

    <p>The groups have different means</p> Signup and view all the answers

    Which distribution is characterized by values being close to the mean and symmetrical?

    <p>Normal distribution</p> Signup and view all the answers

    In which type of distribution are most values not close to the mean?

    <p>Skewed distribution</p> Signup and view all the answers

    What is the term for the assumption that the variances of the groups are approximately equal?

    <p>Homogeneity of variance</p> Signup and view all the answers

    Which test relies on the assumption of homogeneity of variance?

    <p>t-tests</p> Signup and view all the answers

    What is the term for the type of test that relies on important assumptions about the nature of the data being analyzed?

    <p>Parametric test</p> Signup and view all the answers

    What is the term for a symmetrical distribution of values?

    <p>Normal distribution</p> Signup and view all the answers

    What type of distribution is characterized by a constant probability?

    <p>Uniform distribution</p> Signup and view all the answers

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