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11. Infants, even newborns, prefer to look at attractive
faces compared to less attractive faces (Slater, et al.,
1998). In the study, infants from 1 to 6 days old were
shown two photographs of women’s faces. Hevi- ously, a group of adults had rated one of the faces as
significantly more attractive than the other. The babies were positioned in front of a screen on which the pho-
tographs were presented. The pair of faces remained
on the screen until the baby accumulated a total of 20
seconds of looking at one or the other. The number of seconds looking at the attractive face was recorded for each infant. Suppose that the study used a sample
of n = 9 infants and the data produced an average of M = 13 seconds for the attractive face with SS = 72.
If there were no preference, the 20 seconds should be
divided equally between the two photographs. Note
that all the available information comes from the
sample. Specifically, we do not know the population mean or the population standard deviation. State the
null hypothesis and use a two-tailed test with or = .05 to evaluate the hypothesis.

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