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Multiple Choice Quiz
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1
A measurement of the variation from the mean in a sample of numbers is the:
A)coefficient
B)mean
C)mode
D)standard deviation
2
A measure of the dispersion of values is also necessarily a measure of their:
A)normality
B)motion
C)distribution
D)mode
3
What is the most frequently used statistical measure for describing the dispersion of a sample around its mean?
A)Standard deviation
B)Range
C)Coefficient of variation
D)Mode
4
What is the mean value of the following set of data: 15, 18, 15, 15, 16, 16, 15, 16?
A)14
B)15
C)16
D)17
5
To determine the mean of a set of data, the first step is to:
A)calculate the median
B)add the sum of the values in the set
C)determine the standard deviation of the set of values
D)calculate the mode first and then the sum
6
What units are used in the reporting of the mean?
A)Percent
B)The units contained in the original set of values
C)No units are used for the mean
D)Milligrams
7
When a number is squared:
A)it always results in a positive number
B)it always results in a negative number
C)the resulting number is never positive
D)the square root must be determined if the number is negative
8
The arithmetic average in statistics is called the:
A)mode
B)mean
C)median
D)sum
9
Which of the following is NOT a true statement about the coefficient of variation?
A)The coefficient of variation is expressed as a percent of the mean and is unitless
B)The coefficient of variation is commonly used in POLs as a measure of precision
C)The larger the coefficient of variation, the greater the precision
D)The coefficient of variation is used to compare the precision of two different laboratory methods
10
Statistics can best be defined as:
A)calculating numerical values
B)taking the square root of a set of data
C)determining the range over a set of numbers that have been recorded for a period of time
D)data analysis





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