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Summer 2021 math 214 chapter 3

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Across
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A value at the center or middle of a data set
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Measures of location that divide a set of data into four groups with about 25% of the values in each group.
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Measures of location that divides a data set into 100 equal parts with about 1% of the values in each group.
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The standard deviation divided by the mean times 100. gives a way to compare variation of data sets with different units as long as the data are non negative.
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Applies to any data set. proportion of values of data lying within K standard deviations of the mean is at least 1 - 1/k^2 , where K > 1.
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Extremely high or low values in a data set.
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A.k.a - the" 50th percentile" . This is the middle value when the data set had been sorted.
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A.k.a -- "arithmetic mean." This is found by adding all of the data values and dividing the total by the number of data values
Down
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Number of standard deviations a data value is above or below the mean.
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The average of the lowest and highest data value of a data set.
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Used to identify what values are significantly low, significantly high or not significant.
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A measure of how much data values deviate away from the mean.
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Applies only to normal data. about 68% of values within 1 standard deviation of the mean, about 95% of values within two standard deviations of the mean, about 99.7% ( almost all) of the data values are within 3 standard deviations of the mean
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A statistic is know to be this if the presence of extreme values does not cause it to change very much
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The difference between the largest and smallest values in a data set
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This is the value or values that occur with the greatest frequency.