The following table shows Quinton's preference ranking for different brands of boots in both 2011 and 2012.His preferences are ranked from 1 to 4,where 4 is his most-preferred brand and 1 is his least-preferred brand.In 2011,one of Quinton's 10 close friends owned a pair of UGG boots.In 2012,six of Quinton's 11 close friends owned a pair of UGG boots.Based on this information,which effect would likely explain the change in Quinton's preference ranking for UGG boots from 2011 to 2012?

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The Answer of The following table shows Quinton's preference ranking for different brands of boots in both 2011 and 2012.His preferences are ranked from 1 to 4,where 4 is his most-preferred brand and 1 is his least-preferred brand.In 2011,one of Quinton's 10 close friends owned a pair of UGG boots.In 2012,six of Quinton's 11 close friends owned a pair of UGG boots.Based on this information,which effect would likely explain the change in Quinton's preference ranking for UGG boots from 2011 to 2012?

The Following Table Shows Quinton's Preference Ranking for Different Brands