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Multiple Choice Quiz
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1
The population mean is the average of the population measurements.
A)True
B)False
2
It is appropriate to use the Empirical Rule to describe a population that is extremely skewed.
A)True
B)False
3
The median is the value below which and above which approximately 50 percent of the measurements lie.
A)True
B)False
4
A normal population has 99.73 percent of the population measurements within ________ standard deviations of the mean.
A)one
B)two
C)three
D)four
5
All of the following are measures of central tendency except the
A)range.
B)mode.
C)mean.
D)median.
6
Which percentile describes the first quartile, Q1?
A)25th
B)50th
C)75th
D)100th
7
When a population is skewed to the left or right with a very long tail, what is the best measure to use for central tendency?
A)Population mean
B)Population mode
C)Population median
D)Population standard deviation
8
In general, an interval that contains a specified percentage of the individual measurements in a population is called a three sigma interval.
A)True
B)False
9
The standardized value of any value in a population or sample is called a __________.
A)percentile
B)coefficient of variation
C)quartile
D)Z-score
10
If the mean, median, and mode for a given population all equal 25, then we know that its distribution is
A)bimodal.
B)skewed to the right.
C)symmetric.
D)skewed to the left.
11
When using Chebyshev's theorem to obtain the bounds for 99.73 percent of the values in a population, the interval generally will be _______ the interval obtained for the same percentage if a normal distribution is assumed (Empirical Rule).
A)narrower than
B)wider than
C)the same as
12
The covariance measures the strength of the relationship between x and y.
A)True
B)False
13
The correlation coefficient always falls between
A)0 and +1
B)-1 and 0
C)-1 and +1
D)There are no limits.
14
Which of the following choices is not part of the five-number summary?
A)Minimum
B)Maximum
C)Mean
D)Median
E)Third Quartile
15
The lower limit in a box-and-whiskers display is located 1.5 + IQR below Q1.
A)True
B)False





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