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Quiz 5 Normal Probability Distribution

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**1. Which of the following is NOT characteristic of a normal distribution?**

a) area is 1.0 b) is symmetrical c) standard deviation equals the mean d) never reaches zero

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**2. What percentage of the normal distribution is +/–1 SD?**

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**3. Calculate the z-value that defines the 80th-percentile score in normally distribute data?**

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**a) +/- 0.32 b) +/- 0.68 c) +/- 1.16 d) +/- 2.00**

4. What z-values define the 75th-percentile scores about the mean (12.5% in each tail)? a) +/- 0.32 b) +/- 0.68 c) +/- 1.16 d) +/- 2.00

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**5. What percentage of scores in a normal distribution lie below a z-score of –1.50?**

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**6. What score is needed to be in the top 66% on a test with a mean of 40 and a SD of 10?**

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**7. What is the standard error of the mean for a sample of size 5 with standard deviation of 20.0?**

b) 5.33 c) 6.25 d) 8.94

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**8. The Finite Population Correction Factor should be used when ______.**

a) the sample size is >5% of the population size b) when there are outliers in the data c) sample data are skewed d) population is greater than

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