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FREE Bachelor of Arts in Psychology: Methodical & Stats Analysis Questions and Answers Flashcards

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  1. A researcher finds a correlation of r = 0.85 between study hours and exam scores. What percentage of variance in exam scores is explained by study hours?

    Answer: 72.25%

    The coefficient of determination (r²) is 0.85² = 0.7225, meaning 72.25% of variance is explained.

  2. Which measure of central tendency is most appropriate for highly skewed income data?

    Answer: Median

    The median is resistant to extreme values and best represents the center of skewed distributions.

  3. In a 2x3 factorial ANOVA, how many interaction effects can be tested?

    Answer: 1

    A two-factor ANOVA has exactly one interaction effect between the two independent variables.

  4. A psychologist wants to determine if therapy type predicts group membership (improved vs. not improved). Which test is most appropriate?

    Answer: Chi-square test of independence

    Chi-square tests whether two categorical variables are independent of each other.

  5. What does a p-value of 0.03 indicate in hypothesis testing at α = 0.05?

    Answer: Reject the null hypothesis

    Since p (0.03) is less than α (0.05), there is sufficient evidence to reject the null hypothesis.

  6. Which sampling method involves dividing the population into subgroups and randomly selecting from each subgroup?

    Answer: Stratified random sampling

    Stratified sampling divides the population into homogeneous strata and samples randomly within each.