T/F 1. An individual score at the 10th percentile is among the top tenth of the

Question

T/F 1. An individual score at the 10th percentile is among the top tenth of the distribution 2. A negative z score always yields a negative percentile 3. A positive z score always yields a percentile rank above 50 4. A negative z score always indicates that the raw score is below the mean 5. Between z scores of +- 3.00 under the normal curve can be found almost the entire distribution 6. A z score of zero always indicates that the raw score coincides with the mean 7. In a normal distribution, it is sometimes possible for the mean to occur above the 50th percentile 8. Normal distributions must always be unimodal 9. All unimodal distributions are normal 10. For a normal distribution, 50% of the z scores must be positive T/F 1. An individual score at the 10th percentile is among the top tenth of the distribution 2. A negative z score always yields a negative percentile 3. A positive z score always yields a percentile rank above 50 4. A negative z score always indicates that the raw score is below the mean 5. Between z scores of +- 3.00 under the normal curve can be found almost the entire distribution 6. A z score of zero always indicates that the raw score coincides with the mean 7. In a normal distribution, it is sometimes possible for the mean to occur above the 50th percentile 8. Normal distributions must always be unimodal 9. All unimodal distributions are normal 10. For a normal distribution, 50% of the z scores must be positive 1. An individual score at the 10th percentile is among the top tenth of the distribution 2. A negative z score always yields a negative percentile 3. A positive z score always yields a percentile rank above 50 4. A negative z score always indicates that the raw score is below the mean 5. Between z scores of +- 3.00 under the normal curve can be found almost the entire distribution 6. A z score of zero always indicates that the raw score coincides with the mean 7. In a normal distribution, it is sometimes possible for the mean to occur above the 50th percentile 8. Normal distributions must always be unimodal 9. All unimodal distributions are normal 10. For a normal distribution, 50% of the z scores must be positive

Explanation / Answer

(1) False - An individual score at the 10th percentile is among the bottom tenth of the distribution

(2) False - A negative z- score gives a positive percentile rank less than 50

(3) True - A positive z score always yields a percentile rank above 50

(4) True -  A negative z score always indicates that the raw score is below the mean because the mean corresponds to a z- score of 0.

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