The test is split in half. The scores on the first half of the test have a variance of 9, and scores on the second half

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answerhappygod
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The test is split in half. The scores on the first half of the test have a variance of 9, and scores on the second half

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The test is split in half. The scores on the first half of the test have a variance of 9, and scores on the second half have a variance of 12. The correlation between the scores on the two halves is 0.50. The variance of the total test score is 32.7.
a. Calculate the reliability of the entire test using coefficient 𝛼.
b. Calculate the reliability using Spearman-Brown formula.
c. Interpret the results in (a) and (b). Discuss the difference / similarities between two coefficients.
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