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Unit 3 · Psychological Testing Psychology · June 2020 · 25 Sep 2020, Shift 1

A psychologist developed a scale for measuring warmth and competence dimensions. As a part of scale development, she factor analysed 25 items to retain 20 items. She chose Exploratory Factor Analysis (EFA). The Bartlett's test = 237.8, p < .001. The overall Kaiser-Meyer-Olkin test (KMO) is 0.89. Principal Components Analysis (PCA) was used to extract components. The first eight eigenvalues were 9.9, 6.5, 1.6, 1.00, 0.85, 0.83, 0.82 and 0.79. She retained factors on the basis of scree plot and rotated them using varimax criteria. Three items showed cross-loadings, eighteen items loaded on only one of the factors, and remaining items did not load on any factors.

The Bartlett's test results in the above study suggested that

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Correct answer: A. Population correlation matrix is not an identity matrix

Explanation

A significant Bartlett test rejects the hypothesis that the population correlation matrix is an identity matrix, so factor analysis is appropriate.

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