If Y=-8X - 5 and SD of X is 3, then SD of Y is______________?
Correct answer: C. 24
- A. 8
- B. 3
- C. 24
- D. None of these
Explanation
For a linear transformation Y = aX + b, the standard deviation is |a| times the standard deviation of X; the constant b has no effect. Hence SD(Y) = |-8| × 3 = 24.
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