University bookstores order books that instructors adopt for their courses. The number of copies ordered matches the projected demand. However, at the end of the semester, the bookstore has too many copies on hand and must return them to the publisher. A bookstore has a policy that the proportion of books returned should be kept as small as possible. The average is supposed to be less than 10%. To see whether the policy is working, a random sample of book titles was drawn, and the fraction of the total originally ordered that are returned is recorded and listed here. Can we infer at the 10% significance level that the mean proportion of returns is less than 10%? 4 15 11 7 5 9 4 3 5 8
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
University bookstores order books that instructors adopt for their courses. The number of
copies ordered matches the projected demand. However, at the end of the semester, the
bookstore has too many copies on hand and must return them to the publisher. A bookstore
has a policy that the proportion of books returned should be kept as small as possible. The
average is supposed to be less than 10%. To see whether the policy is working, a random
sample of book titles was drawn, and the fraction of the total originally ordered that are
returned is recorded and listed here. Can we infer at the 10% significance level that the mean
proportion of returns is less than 10%?
4 15 11 7 5 9 4 3 5 8
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