Psychology Statistics Practice Test

What is the value of Σ(X − 1)^2 for the scores 1, 2, 1, 4?

10 16 36 49

Correct Answer:

Explanation:

You’re summing squared deviations from 1. For each score, subtract 1 and square, then add them all up. Compute: 1 gives (1−1)² = 0; 2 gives (2−1)² = 1; the next 1 gives (1−1)² = 0; 4 gives (4−1)² = 9. Add them: 0 + 1 + 0 + 9 = 10. So the value is 10.

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