To work in the word-processing department at Dewey, Cheatem, and Howe, a large center-city law firm, you must be able to type at least 80 words per minute. The director of the human resources department is revising the job description. The mean typing speed of 100 samples is 93 words per minute with a population standard deviation of 7 words per minute. Assume that typing speeds follow an approximately normal distribution. What is the confidence level of the interval (91.37, 94.63) for the mean number of words typed by word processors at his law firm? a. 95% b. 90% c. 99% d. 98%

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 re…

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.