3-2: Measures of center
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Measure of center | The value at the center or middle of a data set
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| Arithmetic Mean(Mean) | the measure of center obtained by adding the values and dividing the total bythe number of values. (What most people call an average)
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| Median | middle value whne the original data values are arranged in order of increasing (or decreasing) magnitude
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| Mode | value that occurs with the greatest frequency, can have 1, more than 1, or no mode
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| Midrange | the valuse midway between the maximum and minimum values in the original data set.
midrange= (maximum value + minimum value) divided by 2
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| Weighted Mean | When data values are assigned different weights, we can compute a weighted mean
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| Symmetric | distribution of data is symmetric if the left half of its histogram is roughly a mirror image of its right half
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| skewed | distribution of dara is skewed if it is not symmetric and extends more to one side than the other
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| Skewed to the left | (also called megatively skewed) have a longer left tail, mean and medial are to the left of the mode
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| Skewed to the right | (also called positively skewed) have a longer right tail, mean and medial are to the right of the mode
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Created by:
crickie11
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