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2122REV. Ch1,2

# 2122REV. Ch1,2 - DESCRIPTIVE STATISTICS REVIEW A True and...

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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 bell-shaped distributions, at least 95 percent of the observations in a data set fall within two standard deviations of the mean.

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2122REV. Ch1,2 - DESCRIPTIVE STATISTICS REVIEW A True and...

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