Diagnose the error in the student's conclusion. Explain why their statement is incorrect by defining how the actual findings demonstrate an interaction effect rather than a simple main effect of hypochondriasis.
Case context: A student researcher is analyzing the results of a replication of the study by Brown and colleagues. They observe that participants in the high-hypochondriasis group recalled a very high number of negative health-related words. Based on this observation alone, the student concludes: 'This finding demonstrates that hypochondriasis has a main effect on memory, where high hypochondriasis always improves word recall regardless of the word type.'
Question: Diagnose the error in the student's conclusion. Explain why their statement is incorrect by defining how the actual findings demonstrate an interaction effect rather than a simple main effect of hypochondriasis.
Sample answer: The student's conclusion is incorrect because they ignore the results for the non-health-related words and misinterpret a simple effect as a main effect. An interaction effect means that the influence of one independent variable (hypochondriasis level) on the dependent variable (memory recall) depends on the level of the second independent variable (word type). While high hypochondriasis improved recall for negative health-related words, it did not improve recall for non-health-related words, where both groups performed similarly. Therefore, hypochondriasis does not 'always' improve word recall.
Key points:
- Identify that the student incorrectly concluded a main effect of hypochondriasis across all word types.
- Define an interaction effect as the influence of one variable (hypochondriasis) depending on the level of another (word type).
- Explain that high hypochondriasis only improves recall for negative health-related words.
- Explain that both groups have similar recall rates for non-health-related words, meaning hypochondriasis does not always improve recall.
Rubric: The answer must explain that: 1) The student incorrectly assumed a general main effect when the effect is conditional. 2) An interaction is defined by the effect of hypochondriasis depending on the word type. 3) The empirical pattern must be described (better recall for health words in high hypochondriasis, but no difference/similar recall for non-health words).
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Based on the study by Brown and colleagues described in the context, state the primary hypothesis, identify the two independent variables (including their levels), and describe the specific findings that demonstrated the interaction effect on memory recall.
Diagnose the error in the student's conclusion. Explain why their statement is incorrect by defining how the actual findings demonstrate an interaction effect rather than a simple main effect of hypochondriasis.
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