Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The area under the standard normal curve
corresponding to –0.3<Z<1.6 is
a. | 0.4713 | b. | 0.9542 | c. | 0.3273 | d. | 0.5631 | e. | None of the
above |
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2.
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Which of the following are true
statements?
I.
The area under a normal curve is always 1, regardless of the mean and
standard
deviation.
II. The mean is always equal to the median for any normal
distribution.
III. The interquartile range for any normal curve
extends from µ–1s to µ+1s.
a. | I and III | b. | I, II, and III | c. | I and
II | d. | II and III | e. | None of the above gives the correct set of true
responses. |
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3.
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If the heights of 99.7% of American men are between
5'0" and 7'0", what is your estimate of the standard
deviation of the height of American men?
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4.
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Suppose that the distribution of math SAT scores
from your state this year is normally distributed with mean 480 and standard deviation 100 for males,
and mean 440 and standard deviation 120 for females. If someone who scores 780 or higher on math SAT
can be considered a genius, what is the proportion of geniuses among the male SAT
takers?
a. | 14% | b. | 0.14% | c. | 28% | d. | 3% | e. | 1.4% |
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