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 mean salary of all female workers is
$35,000. The mean salary of all male workers is $41,000. What must be true about the mean
salary of all workers?
a. | It must be larger than the median
salary. | b. | It must be $38,000. | c. | It could be any number between $35,000 and $41,000. | d. | It cannot be larger than $40,000. | e. | It must be larger than $38,000. |
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2.
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A sample of 99 distances has a mean of 24 feet and
a median of 24.5 feet. Unfortunately, it has just been discovered that an observation which was
erroneously recorded as “30” actually had a value of “35”. If we make
this correction to the data, then:
a. | The mean and median are both
increased. | b. | The mean and
median remain the same. | c. | The median remains
the same, but the mean is increased. | d. | We do not know how
the mean and median are affected without further calculations, but the variance is
increased. | e. | The mean remains
the same, but the median is increased. |
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3.
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Forty students took a statistics examination having
a maximum of 50 points. The score distribution is given in the following stem-and-leaf plot:
0|28
1|2245
2|01333358889
3|001356679
4|22444466788
5|000
The third quartile of the score distribution is
equal to:
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4.
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The five-number summary for scores on a statistics
exam is 11, 35, 61, 70, 79. In all, 380 students took the test. About how many had scores
between 35 and 61?
a. | 26 | b. | 76 | c. | 190 | d. | 95 | e. | None of
these |
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