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Quiz 5
 Normal Probability Distribution
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
2. What percentage of the
normal distribution is +/–1 SD?
a) 50%
b) 68%
c) 75%
d) 95%
e) 99%
3. Calculate the z-value that
defines the 80th-percentile score
in normally distribute data?
a) 0.85
b) 0.70
c) 0.75
d) 0.70
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
5. What percentage of scores in a
normal distribution lie below a
z-score of –1.50?
a) 25.0%
b) 10.00%
c) 6.68%
d) 5.25%
6. What score is needed to be
in the top 66% on a test with a
mean of 40 and a SD of 10?
a) 66
b) 50
c) 44
d) 36
7. What is the standard error of
the mean for a sample of size 5
with standard deviation of 20.0?
a) 4.00
b) 5.33
c) 6.25
d) 8.94
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 10 000