DESCRIPTIVE STATISTICS
REVIEW
A.
True and False Questions.
____
A population is the collection of all measurements of interest in a given study.
____
A statistic is a function of all the measurements in a population.
____
A parameter, like μ, is constant that describes certain characteristic of a sample.
____
The median is sensitive to extreme values in one direction.
____
The mode is a measure of variability.
____
The range is a measure of relative standing.
____
The 60
th
percentile of a distribution is that value that exceeds 60 percent of the measurements
and is exceeded by 40 percent of the measurements.
____
The standard deviation of a set of measurements is a measure of variability.
____
If the original units in a data set are (linear) inches, then the standard deviation of the set is
expressed in square inches.
____
According to the "Empirical rule", which applies to bellshaped distributions, at least 95
percent of the observations in a data set fall
within two standard deviations of the mean.
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 Fall '08
 STAFF
 Statistics, Standard Deviation, typographical errors

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