For any population, a z-score of +1.00 corresponds to a location

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For any population, a z-score of +1.00 corresponds to a location exactly 10 points above the mean. True False

2. On an exam, Tom scored 8 points above the mean and had a z-score of +2.00. The standard deviation for the set of exam scores must be s = 4. True False

3. If two individuals in a population have identical X scores, they also will have identical z-scores. True False

4. A population with m = 85 and s = 12 is transformed into z-scores. After the transformation, the population of z-scores will have a standard deviation of _____. s = 12 s = 1.00 s = 0 cannot be determined from the information given

5. For a population with a mean of m = 100, what is the z-score corresponding to a score that is located 10 points below the mean? +1 –1 –10 cannot answer without knowing the standard deviation

6. The Unit Normal Table lists proportions for any distribution, provided that the distribution has been transformed into z-scores. True False

7. A population forms a normal distribution with m = 80 and s = 10. In this population, 42.07% of the scores are less than X = 78. True False

8. What is the probability of randomly selecting a z-score less than z = –0.80 from a normal distribution? 0.7881 0.2119 –0.7881 –0.2119

9. In a normal distribution, what z-score value separates the highest 90% of the scores from the rest of the distribution? z = 1.28 z = –1.28 z = 0.13 z = –0.13

10. For any normal distribution, what are the z-score values that form the boundaries for the middle 80%? z = ±0.25 z = ±0.52 z = ±0.84 z = ±1.28