z-scores practice
Flashcard
•
Mathematics
•
6th - 12th Grade
•
Practice Problem
•
Hard
Wayground Content
FREE Resource
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a z-score?
Back
A z-score indicates how many standard deviations an element is from the mean. It can be positive or negative.
2.
FLASHCARD QUESTION
Front
How do you calculate a z-score?
Back
Z-score = (x - mean) / standard deviation, where x is the value.
3.
FLASHCARD QUESTION
Front
What does a positive z-score indicate?
Back
A positive z-score indicates that the value is above the mean.
4.
FLASHCARD QUESTION
Front
What does a negative z-score indicate?
Back
A negative z-score indicates that the value is below the mean.
5.
FLASHCARD QUESTION
Front
If the mean is 21 and the standard deviation is 1.3, what is the z-score for x = 22?
Back
0.77
6.
FLASHCARD QUESTION
Front
What is the significance of the sign of a z-score?
Back
The sign indicates whether the value is above (positive) or below (negative) the mean.
7.
FLASHCARD QUESTION
Front
What is the z-score for a value that is 0.5 standard deviations above the mean?
Back
+0.50
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