Statistical Sciences 1024A/B Chapter Notes - Chapter Chapter 2: Box Plot, Descriptive Statistics, Quartile
28 Oct 2021
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Descriptive statistics = methods to summarize and describe important features of the data. Spotting suspected outliers and the modified boxplot. Sum of values / the total # of values there are. Is affected by extremely large or extremely small numbers = is not a resistant measure of centre. Is the middle value in an ordered array of numbers. Splits the dataset into 2 halves: the values above the median, and the values below. Is unaffected by extremely large/small numbers = is a resistant measure of centre. Allows you to see the measure of centre and a measure of spread. Is the distance b/w the first and third quartiles. Call an observation a suspected outlier if it falls more than 1. 5 x iqr above the third quartile or below the first quartile. Subtract mean of the data from each data value. A deviation will be positive if the observation is larger than the mean; negative if it"s smaller than the mean.
