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Chapter Quiz
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1
A key difference between calculating the sample mean and the population mean is
A)We use <a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0073401781/820197/Xbar.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>and n instead of μ and N.
B)We divide the sum of the observations by n - 1 instead of n.
C)The sample observations are ranked and the middle value is selected as the population mean.
D)There are no differences.
2
Which of the following measures of central location is affected most by extreme values?
A)Median
B)Mean
C)Mode
D)Variance
3
What scale of measurement cannot be used to determine the median?
A)Nominal
B)Ordinal
C)Interval
D)Ratio
4
In a set of observations, which measure of central tendency reports the value that occurs most often?
A)Mean
B)Median
C)Mode
D)Standard deviation
5
The weighted mean is a special case of the
A)Arithmetic Mean
B)Median
C)Mode
D)Standard deviation
6
In comparing two different samples of 100 observations, one sample has a mean of 10 and a standard deviation of 10. The second sample has a mean of 10 and a standard deviation of 50. The two samples are
A)Exactly the same.
B)Are centered at 10, but the first sample's data is more concentrated near the mean.
C)Are centered at 10, but the second sample's data is more concentrated near the mean.
D)Are positively skewed.
7
For a distribution, the mean is 5, the median is 15, and the mode is 20. Based on this information, the distribution is:
A)Positively skewed
B)Negatively skewed
C)Symmetric
D)Bell-shaped
8
Which measure of central tendency is the largest in a positively skewed distribution?
A)Mean
B)Median
C)Mode
D)Variance
9
Which of the following statistics is a measure of dispersion?
A)Mean
B)Median
C)Mode
D)Standard deviation
10
A disadvantage of the range is
A)Only two values are used in its calculation.
B)It is in different units than the mean.
C)It does not exist for some data sets.
D)All values are used in its calculation.
11
The numerator of the mean deviation is
A)The sum of squared deviations from the mean.
B)The variance.
C)The sum of the absolute values of deviations from the mean.
D)Always reported in units squared.
12
The standard deviation is
A)Based on squared deviations from the mean.
B)Expressed in the same units as the mean.
C)Uses all the observations in its calculation.
D)All of the above.
13
The variance is
A)Found by dividing N by the mean.
B)Expressed in the same units as the original data.
C)Found by squaring the standard deviation.
D)The square root of the standard deviation.
14
In a negatively skewed distribution
A)The mean, median, and mode are all equal.
B)The mean is larger than the median.
C)The median is larger than the mean.
D)The standard deviation must be larger than the mean or the median.







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