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The accompanying table shows Cassie's preference ranking for different brands of boots in both 2011 and 2012. Her preferences are ranked from 1 to 4, where 4 is her most-preferred brand and 1 is her least-preferred brand. In 2011, one of Cassie's ten close friends owned a pair of Ugg boots. In 2012, six of Cassie's eleven close friends owned a pair of Ugg boots. Based on this information, which effect would likely explain the change in Cassie's preference ranking for Ugg boots from 2011 to 2012?
Variability
The extent to which data points in a statistical distribution or data set diverge from the average or mean, indicating the dispersion in the dataset.
Mean
The arithmetic average of a set of numbers, found by dividing the sum of all numbers in the set by the count of numbers.
Qualitative Variables
Variables that describe or categorize attributes or characteristics that are not numerical but can be observed qualitatively.
Summarized
The presentation of data or information in a condensed form, highlighting the main points or statistics.
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