Sixteen people were given two types of cereal, Brand X and Brand Y. Two people preferred Brand X and thirteen people preferred Brand Y. We want to determine whether or not customers prefer one brand over the other. The null hypothesis that is being tested is
A. H0: ? = 8.
B. H0: ? = .5.
C. H0: p = 8.
D. H0: p = .5.
Answer: D
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