DA0-002 Data Analysis Practice Question
A data analyst wants to use a Z-score to standardize a dataset. The variable has a mean of 50 and a standard deviation of 10. What is the Z-score for a raw value of 70?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
2
Z = (X - mean) / std = (70 - 50) / 10 = 2.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
0.5
Why it's wrong here
Incorrect calculation.
- ✗
20
Why it's wrong here
Incorrect calculation.
- ✗
-2
Why it's wrong here
Incorrect sign.
- ✓
2
Why this is correct
Correct Z-score.
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Written by Johnson Ajibi, MSc IT Security
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