Suppose we have information about the supermarket purchases of 100 million people. Each person goes to the supermarket 100 times in a year and buys 10 of the 1000 items that the supermarket sells. We believe that a pair of terrorists will buy exactly the same set of 10 items (perhaps the ingredients for a bomb?) at some time during the year. If we search for pairs of people who have bought the same set of items, would we expect that any such people found were truly terrorists?
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.
Suppose we have information about the supermarket purchases of 100 million people. Each person goes to the supermarket 100 times in a year and buys 10 of the 1000 items that the supermarket sells. We believe that a pair of terrorists will buy exactly the same set of 10 items (perhaps the ingredients for a bomb?) at some time during the year. If we search for pairs of people who have bought the same set of items, would we expect that any such people found were truly terrorists?
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