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Understanding Z-Scores

19 terms·StudBud Administration

Explore the concept of z-scores and their significance in statistics and hypothesis testing

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Questions 19

Answers

1
Which z-score corresponds to 68% of data?
1
0
-1
2
2
Which formula calculates a z-score?
(X - μ) / σ
(X + μ) / σ
(X - μ) * σ
(X + μ) * σ
3
Which z-score is closest to the mean?
0
1
-1
2
4
What is the z-score for the 99th percentile?
2.58
1.64
0.99
1.96
5
What is the z-score for the 95th percentile?
1.96
0.95
1.64
2.58
6
Which z-score is most unusual?
3
-2
1
0
7
Why use z-scores in statistics?
Compare data points
Determine mode
Find median
Calculate mean
8
How is z-score related to standard deviation?
Directly proportional
Unrelated
Equal
Inversely proportional
9
What does a z-score of 0 mean?
Above mean
No data
At mean
Below mean
10
How do z-scores relate to probability?
Determine mode
Determine likelihood
Calculate mean
Find median
11
What does a z-score represent?
Variance
Standard deviation
Standard score
Mean
12
How are z-scores used in normalization?
Find median
Calculate mean
Standardize data
Determine mode
13
Which z-score is most common?
-1
2
1
0
14
What is the z-score for the mean?
2
-1
0
1
15
What does a negative z-score indicate?
Below mean
At mean
Above mean
No data
16
What does a z-score of 2.5 signify?
No data
Far above mean
Far below mean
At mean
17
What does a high z-score indicate?
No data
At mean
Far from mean
Close to mean
18
How do z-scores help in hypothesis testing?
Find median
Determine significance
Determine mode
Calculate mean
19
What is the z-score for the 50th percentile?
1
2
0
-1