<PRE><B>Question 1052861</B>
Ho: the number of words recalled is unchanged or greater
Ha: the number of words recalled is less.
alpha=0.05, one way test
Paired t-test
4 degrees of freedom
Critical value is -2.132 
difference defined here as number after 24 hours-number after 12 hours.
average d/[s/sqrt(n)]
This is -1.6/(1.14/sqrt(5))
That is t=-3.14
This has a p-value of 0.0175, and we can conclude that there is a significant difference (reject Ho).
The important part of this problem is to use each person as their own control.  The df are less, but the variability is much less.

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