Answer to Question #137254 in Psychology for saakshi

Question #137254
On a numerical ability test consisting of 10 items, the mean of a group of 50 participants was
7.5 and the SD was 2. For the given data, calculate reliability using method of Rational
Equivalence.
Item Probability of 1 2 3 4 5 6 7 8 9 10
getting the correct answer 0.5, 0.8, 0.4, 0.7, 0.6, 0.7, 0.3, 0.7, 0.5, 0.6
1
Expert's answer
2020-10-12T10:59:34-0400

The reliability is given by the number of participants divide by multiplication of the mean, standard deviation, and the number of items:

50/(7.5*2*10)

50/150

Thus, the reliability is 0.3.


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