Podcast
Questions and Answers
Which percentile lines up with a z-score of -3?
Which percentile lines up with a z-score of -3?
- 15.87 percentile
- 0.13 percentile (correct)
- 50th percentile
- 2.28 percentile
What is the percentile that corresponds to a z-score of -2?
What is the percentile that corresponds to a z-score of -2?
- 50th percentile
- 2.28 percentile (correct)
- 0.13 percentile
- 15.87 percentile
What is the percentile that corresponds to a z-score of -1?
What is the percentile that corresponds to a z-score of -1?
- 15.87 percentile (correct)
- 0.13 percentile
- 2.28 percentile
- 50th percentile
What is the percentile that corresponds to a z-score of 0?
What is the percentile that corresponds to a z-score of 0?
Which of the following statements about z-scores is correct?
Which of the following statements about z-scores is correct?
What is the z-score for a score that is two standard deviations above the mean?
What is the z-score for a score that is two standard deviations above the mean?
What is the z-score for a score that is three standard deviations below the mean?
What is the z-score for a score that is three standard deviations below the mean?
If a z-score is 1.5, what can we conclude about the corresponding score?
If a z-score is 1.5, what can we conclude about the corresponding score?
If a score has a z-score of -0.5, what can we conclude about its position relative to the mean?
If a score has a z-score of -0.5, what can we conclude about its position relative to the mean?
Flashcards
What percentile does a z-score of -3 correspond to?
What percentile does a z-score of -3 correspond to?
A z-score of -3 is the same as being three standard deviations below the mean, which corresponds to the 0.13th percentile.
What percentile does a z-score of -2 correspond to?
What percentile does a z-score of -2 correspond to?
A z-score of -2 is the same as being two standard deviations below the mean, which corresponds to the 2.28th percentile.
What percentile does a z-score of -1 correspond to?
What percentile does a z-score of -1 correspond to?
A z-score of -1 represents a value one standard deviation below the mean, which corresponds to the 15.87th percentile.
What percentile does a z-score of 0 correspond to?
What percentile does a z-score of 0 correspond to?
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What does a z-score of +1 represent?
What does a z-score of +1 represent?
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What does a z-score of -3 represent?
What does a z-score of -3 represent?
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What can we conclude about a score with a z-score of 1.5?
What can we conclude about a score with a z-score of 1.5?
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What can we conclude about a score with a z-score of -0.5?
What can we conclude about a score with a z-score of -0.5?
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What does a z-score tell us?
What does a z-score tell us?
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Study Notes
Z-Scores and Percentiles
- A z-score of -3 corresponds to a percentile of approximately 0.13%.
- A z-score of -2 corresponds to a percentile of approximately 2.28%.
- A z-score of -1 corresponds to a percentile of approximately 15.87%.
- A z-score of 0 corresponds to a percentile of 50% (i.e., the mean).
Properties of Z-Scores
- A correct statement about z-scores is: z-scores can be positive or negative, depending on whether the score is above or below the mean.
- A z-score of 2 corresponds to a score that is two standard deviations above the mean.
- A z-score of -3 corresponds to a score that is three standard deviations below the mean.
Interpreting Z-Scores
- If a z-score is 1.5, we can conclude that the corresponding score is 1.5 standard deviations above the mean.
- If a score has a z-score of -0.5, we can conclude that it is 0.5 standard deviations below the mean.
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