3/17/2024 0 Comments Interquartile range mathThe interquartile range is not part of this five-number summary, but is useful alongside it as a measure of dispersion or spread. This information can then be presented in a box plot (box and whisker diagram) making it easy to compare with other sets of data. The median and lower and upper quartiles, along with the minimum value and the maximum value of the data set, form a five-number summary of descriptive statistics for the data set. The IQR is far more representative of the spread of this data set because it is not affected by extreme values. The smaller the value for the interquartile range, the narrower the central 50\% of data for the data set. The larger the interquartile range, the wider the spread of the central 50\% of data. The interquartile range (IQR) is a descriptive statistic, and measures the variability or spread of the data. Note: the lower quartile is the median of the lower half of the data, the upper quartile is the median of the upper half of the data.įind the interquartile range of the following data. Measures of spread such as the range and the interquartile range can be. Learn how to calculate the interquartile range (IQR), a measure of how spread out the data is, using the third and first quartiles. This tells us how spread out the middle 50 of the values are in this particular dataset. In statistics there are three types of average: the mean, the median and the mode. The meaning of INTERQUARTILE RANGE is the range of values of the variable in a statistical distribution that lies between the upper and lower quartiles. Interquartile range \bf th percentile as 75\% of the data lies below this value. To find the interquartile range (IQR), we simply subtract Q1 from Q3: The IQR turns out to be 39.5 23.5 16. Measures of spread such as the range and the interquartile range. In statistics there are three types of average: the mean, the median and the mode. Interquartile range Q3 Q1 Interquartile range Q 3 Q 1. GCSE Edexcel Analysing data - Edexcel Range. Interquartile range is the difference between the upper quartile (or third quartile) and the lower quartile (or first quartile) in an ordered data set. The interquartile range is the distance between the first quartile and the third quartile.
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