1. Quiz 5
Normal Probability Distribution

2. 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

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

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

5. 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

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

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

8. 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

9. 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