Example: 8.6 (Newbold) A random sample of 344 industrial buyers were asked: "What is your firm's policy for purchasing personnel to follow on accepting gifts from vendors?". For 83 of these buyers, the policy of the firm was for the buyer to make his/her own decision. Find a 90% confidence interval for the population proportion of all buyers who are allowed to make their own decisions.

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Q: Liquid leaked from a damaged tank at a rate of r(t) liters per hour. The rate decreased as time…

A: We need to find lower and upper estimate.

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A: To simplify the expression means writing it in the simplest form.

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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.