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8 September, 18:03

Tom wants to use a computer program to assess the reliability of his new intelligence test. The test has 10 items, and the computer program finds the average of all possible split-half correlations between groups of 5 items. What measure of reliability did he use?

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  1. 8 September, 18:18
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    Answer:Cronbach's alpha

    Explanation:

    Cronbach's alpha is used to measure consistency interms of how closely associated items in a group are.

    It measures the scale of reliability as a coefficient of reliability not statistically.

    below is a formula that is used to calculate this reliability.

    α=N¯c/¯v + (N-1) ¯c

    Here N equate to the number of items, ¯c is the average inter-item covariance among the items and ¯v equals the average variance.

    The increase number of items will increase Cronbanch's Alpha.

    Additionally, if the average inter-item correlation is low, alpha will be low.
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