Answers for Assignment_7 (Fall 2008)

Answers for Assignment_7 (Fall 2008) - STAS2126...

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STAS2126 Assignment#7 (Fall 2008) Questions for “Test anxiety and performance” : To answer the questions below, go to Blackboard and download the PDF. You don’t need to print out the whole PDF article. 1. In the literature review (first page of article), what is the average correlation between test anxiety and performance? How much of the variation in “test performance” is explained by this correlation? Based on our class study the correlation between anxiety and quiz scores was -.387. How much variance was explained in this case? r from literature review = -.21 % variance explained = -.21 x -.21.0441=4.4% r from our class study = -.39 % variance explained = -.39 x -.39 = .1521=15.1% 2. Hill and Wigfield (1984) extrapolated from the literature and estimated that about 25% of American primary and secondary students, about 10 million students, suffered lower academic performance due to test anxiety . The underlining is mine… statement suggest that anxiety causes lower performance . Based on the evidence in Q1, what is wrong with this statement? Hill and Wigfield have made the assumption that the correlation between test anxiety and test performance implies causation. The assumption of a causal relationship is evident in their statement that students suffered lower academic performance due to test anxiety …test anxiety CAUSED the lower performance. It is wrong to conclude that causality can be inferred only from a correlation. Anxiety may be a contributing factor to poor test performance but a correlation does not prove this cause-effect relationship; the correlation only suggests that it may be possible. It may be just as likely that inadequate preparation for tests leads to anxiety which in turn leads to poor test performance. In this case, the correlation between anxiety and performance still exists but inadequate preparation and NOT anxiety is the cause. 3a. The researchers asked students their cumulative GPA (.00-4.00). In addition, students were asked to identify using a self-report scale if their grades were: mostly As, about half As and half Bs, mostly Bs, about half Bs and half Cs, mostly Cs, about half Cs and half Ds, mostly Ds, or mostly below D. In research by Dornbusch, what were the correlations between self-reported GPA and GPA from official records? (see Method –Materials) The correlations were r=.76 and r= .80. 3b. The Dornbusch correlations compare a very accurate measure of GPA (official records) with self-reported GPA. For this reason, these correlations are indicators of the validity of self-reported GPA. Based on the Dornbusch results would you say that validity of self-reported measures of GPA is adequate (briefly explain)? The correlations were quite string indicating that student estimates of their GPAs generally were consistent with
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Answers for Assignment_7 (Fall 2008) - STAS2126...

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