Standard normal variable Z is___________?
Correct answer: A. x - µ /σ
- A. x - µ /σ
- B. µ- x /σ
- C. σ - x/ µ
- D. x - σ/ µ
Explanation
The standard normal variable is obtained by measuring X's deviation from the mean and expressing it in standard-deviation units: Z = (X − μ)/σ. Reversing the subtraction changes the sign and is not the standard definition.
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