A company sends a random sample of 16 of its sales people to a course designed to increase their motivation and, hence, presumably their effectiveness. In the following year these people generated sales with an average value of $625,000 and a sample standard deviation of $80,000. During the same period, an independently chosen random sample of 10 salespeople who had not attended the course obtained sales with an average value of $608,000 and a sample standard deviation of $73,000. Assume that the two population distributions are normal and have the same variance. Find a 90% confidence interval estimate for the difference between the population mean sales for sales-people who attended the motivational course and for those salespeople who did not attend the course.
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.
A company sends a random sample of 16 of its sales people to a course designed to increase their motivation and, hence, presumably their effectiveness. In the following year these people generated sales with an average value of $625,000 and a sample standard deviation of $80,000. During the same period, an independently chosen random sample of 10 salespeople who had not attended the course obtained sales with an average value of $608,000 and a sample standard deviation of $73,000. Assume that the two population distributions are normal and have the same variance. Find a 90% confidence
Step by step
Solved in 2 steps with 1 images
