Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: spinning 1964
Replies: 0

 Jeff.Witmer@oberlin.edu Posts: 308 Registered: 12/6/04
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 year-to-year
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