7.3 - Outliers

7.3 The Effects of Outliers on Average Focus: understand how mean, median, and mode are affected by outliers. Create a stem and leaf chart using the data in Explore - p. 267: Then, Calculate the...mean ...median ...mode Now remove the outlier(s) and recalculate the ...mean ...median ...mode *An outlier is any number(s) in a set of data which is significantly different than the others *An outlier is much larger or much smaller than the other data *Some outliers occur as a result of an error in recording or measurement; these values should be ignored in any calculations *Sometimes outliers must not be ignored...they may provide important information...eg. really high or low test score!!!!!! *Not all outliers are obvious *Selecting outliers is sometimes a matter of choice. Example - the outliers in our data above are 8, 47, and 97 Practice page 269-70, #1-4 and 6 Stem and Leaf Plot Required!!!!