The boxes visualize the interquartile range, and the hinges show the minimum and maximum value, but exclude outliers. This still doesn't show the density distribution, …... The interquartile range is a method of measuring the spread of the middle 50% of the values and is useful since it ignore the extreme values. The lower quartile is (n+1)/4 th value (n is the cumulative frequency, i.e. 157 in this case) and the upper quartile is the 3(n+1)/4 the value.
Interquartile Range In descriptive statistics, the interquartile range (IQR) is a measure of statistical dispersion, being equal to the difference between the third and first quartiles. It is also called the midspread or middle fifty. forgot wifi password how to find from laptop The interquartile range is more useful as a measure of spread than the range because of this stability. It is recommended that a graph of the distribution is used to check the appropriateness of the interquartile range as a measure of spread and to emphasise its meaning as a feature of the distribution.
Finding the interquartile range A cumulative frequency diagram is also a good way to find the interquartile range , which is the difference between the upper quartile and lower quartile .
Next watch how a cumulative frequency curve is used to find the interquartile range of grouped frequency data. Again, it's a matter of finding the lower and upper quartiles so we can work out the interquartile range.
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The interquartile range is the difference between the third quartile and the first quartile. Sign up for free to access more statistics resources like . Wyzant Resources features blogs, videos, lessons, and more about statistics and over 250 other subjects.