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spinning 1964
Posted:
Nov 14, 1996 12:28 PM


In response to Chuck Biehl's note about 1964D pennies, my experience is that a 1962 penny comes up heads only about 10% of the time when spun, which is even farther from .5 than the 1964D result that Chuck mentions.
Of course, the point of the "spinning pennies" activity is to develop an understanding of what is meant by a sampling distirbution (of a sample percentage, in this case). So I make everyone use a penny from the same year when I use this activity, in order to eliminate the yeartoyear variation caused by the Mint. But I tell my class that for pennies from the early 1960's the proportion of heads is even farther from .5 than what we got as a class.
Jeff Witmer Oberlin College



