Amanda needs to do a telephone survey to collect data. She calls phone numbers randomly selected until someone answer the call. Each call has a 20% probability to be answered. Let X to be the number of phone numbers Amanda calls until someone answers. What type of distribution does X follow? Bernoulli distribution O None of those O Binomial distribution Geometric distribution
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.
Amanda's telephonic survey has only outcomes, i.e someone answers it or someone doesn't. And there is a defined probability of success, i.e getting a phone call answered (i.e 0.2). Again, the calling of random phone numbers is definitely discrete in nature.
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