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16. In a recent study, Piff, Kraus, Cote, Cheng, and
Keltner (2010) found that people from lower socio-
economic classes tend to display greater prosocial
behavior than their higher-class counterparts. In one
part of the study, participants played a game with an
anonymous partner. Part of the game involved sharing
points with the partner. The lower economic class
participants were significantly more generous with
their points compared with the upper-class individu-
als. Results similar to those found in the study, show
that n = 12 lower-class participants shared an average
of M - 5.2 points with SS - 11.91, compared to an
average of M = 4.3 with SS = 9.21 for the n = 12
upper-class participants.
a. Are the data sufficient to conclude that there is a
significant mean difference between the two eco-
nomic populations? Use a two-tailed test with
O = .05.
b. Construct an 80% confidence interval to estimate
the size of the population mean difference.

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a Reject Ho and conclude that there is sufficient evidence... View the full answer

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