Fifteen 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. To test the null hypothesis, the appropriate probability distribution to use is
A) normal.
B) chi-square.
C) Poisson.
D) binomial.

Question

Quizplus · Accepted Answer

Since each person can prefer only one brand (either X or Y), and we are interested in comparing the preference for two brands, the appropriate probability distribution to use is the binomial distribution.

Fifteen People Were Given Two Types of Cereal, Brand X