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1 – Review the three “Non-parametric” test videos in the Calculations section of the “Statistics Visual
Learner” media piece.
http://lc.gcumedia.com/hlt362v/the-visual-learner/the-visual-learner-v2.1.html
A researcher is examining preferences among four new flavors of ice cream. A sample of n = 80 people is
obtained. Each person tastes all four flavors and then picks a favorite. The distribution of preferences is
as follows. Do these data indicate any significance preferences among the four flavors? Test at the .05
level of significance.
Ice Cream Flavor
A
B
C
D
12
18
28
22
2 – Is it true that parametric tests are generally more powerful than nonparametric tests? If so, give two
reasons why you might choose to use a nonparametric test instead of a parametric test.
3 – Parametric vs Nonparametric
Discuss the difference between parametric test and non-parametric test. When do we use a non-
parametric test?
Sample Solution
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