According to a recent survey, 78% of web users share their password with others. Consider a random selection of 45 users and denote the proportion of them sharing their password as p. a. Calculate the mean and the standard error for p. b. Describe the sampling distribution of p and draw a graph of this probability distribution with its mean and standard deviation. c. What is the probability that less than 90% of them are sharing their password with others? d. What is the probability that more than 60% of them are sharing their password with others?

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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.