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Topic: Acorn Free-Response #3
Replies: 2   Last Post: May 4, 1997 1:52 AM

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Kevin Rees

Posts: 28
Registered: 12/6/04
Acorn Free-Response #3
Posted: May 2, 1997 7:34 PM
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Yesterday I gave a full 3-hour practice AP to my 21 students taking the
exam and used the Acorn Free-Response #3 on it. It asks for a 99%
confidence interval for the difference of two means (small sample) to check
whether there is a significant difference. Most of my students had
forgotten that CI and instead used a hypothesis test of two means,
correctly leading them to the same conclusion they would have gotten from
the confidence interval. Most then gave an eloquent conclusion that
adequately answered the problem. From this list I realize that the
problems will be graded between 1 and 4 with half for work and half for
explanation. My question is this, if they have adequately answered the
question how much will they be penalized for using a hypothesis test
instead of the asked for confidence interval? In practice there is no
difference in the two methods, so I am not sure how to grade it. It seems
awfully harsh to give an excellent response to the question a 3 because
they didn't follow the directions and used a hypothesis test, but I feel
something must be taken off for it.
What do you all think?
Kevin Rees
The Hill School
Pottstown, PA

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