In a study of memory recall, 8 students from a large psychology class were selected at random and given
10 minutes to memorize a list of 20 nonsense words. Each was asked to list as many of the words as they
could remember both 1 hour and 24 hours later. The data are given in the accompanying table.
Subject 1 2 3 4 5 6 7 8
1 hr later 14 12 18 7 11 9 16 15
24 hr later 10 4 13 6 9 6 13 12
Construct a 90% confidence interval for the difference in mean number of words remembered after 1 hour
and after 24 hours. (Use 1 Hour Later − 24 Hours Later. Enter your answer using interval notation. Round
your numerical values to four decimal places.)
_________ that the true difference in mean number of words recalled between 1 hour later and 24 hours later falls _________ this interval. The bounds of the interval suggest the
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mean number of words recalled after 1 hour is higher and the mean number of words recalled after 24 hours is lower.
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