Math Homework. One needs to calculate median, quartiles, including IQR, Q1, and Q3. EXAMPLE: Outlier. An outlier is any value that is numerically distant from most of the other data points in a set of data. Math Open Reference. Home; Outliers An outlier is a value in a data set that is very different from the other values. Home Contact About Subject Index. As you can see in the figure above, most of the data points cluster around the straight line fairly closely. 90,86,15,86,92 15 would be an outlier in this data set. The outlier formula is represented as follows, The Formula for Q1 = ¼ (n + 1) th term The Formula for Q3 = ¾ (n + 1) th term The Formula for Q2 = Q3 – Q1. Oo; outlier • a value far away from most of the rest in a set of data. In statistics, an outlier is a data point that significantly differs from the other data points in a sample. A value in a data set that lies far outside of a pattern they establish. home / study / math / statistics and probability / statistics and probability definitions / outlier Outlier If there are any extremely high or low values in the given data set when compared to other values then such values are termed as outliers. A convenient definition of an outlier is a point which falls more than 1.5 times the interquartile range above the third quartile or below the first quartile. For example, the point on the far left in the above figure is an outlier. Measurement error, experiment error, and chance are common sources of outliers. Outliers are often easy to spot in histograms. Often, outliers in a data set can alert statisticians to experimental abnormalities or errors in the measurements taken, which may cause them to omit the outliers from the data set. Do It Faster, Learn It Better. Said differently, low outliers shall lie below Q1-1.5 IQRand high outliers shall lie Q3+1.5IQR. An outlier is a number in a data set that is much smaller or larger than the other numbers in the data set. Multiplying the interquartile range (IQR) by 1.5 will give us a way to determine whether a certain value is an outlier. In most cases, outliers have influence on mean , but not on the median , or mode . Determining Outliers . If we subtract 1.5 x IQR from the first quartile, any data values that are less than this number are considered outliers. One definition of outlier is any data point more than 1.5 interquartile ranges (IQRs) below the first quartile or above the third quartile.. How to use outlier in a sentence. A data point that is distinctly separate from the rest of the data. An outlier is a number in a data set that is much smaller or larger than the other numbers in the data set. Transcript Welcome to MooMooMath where we upload a new Math video everyday. That is, outliers are values unusually far from the middle. Definition of 'outlier' as used in statistics. 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