Learn how to identify a random variable in a scenario, and see examples that walk through sample problems step-by-step for you to improve your statistics knowledge and skills.

A. The random variable of interest for each population has a normal probability distribution. B. The variance associated with the random variable must be the same for each population. C. At …

Understand what is a random variable and why it is used. Learn about the types of random variables and see examples of the random variables from everyday life.

Which of the following is NOT a true statement about the binomial probability distribution? A. The random variable of interest is continuous B. Each outcome is independent of each other C. …

Assume that the random variable of interest is the number of Northeastern states with an unemployment rate in November that was less than 4.5%. What values may this random …

Learn the difference between observational studies and experiments. Examine experimental study's definition and see examples of observational studies vs experiments.

A manufacturing company has developed a machine for cleaning carpet that is fuel efficient because it delivers carpet cleaner so rapidly. Of interest is a random variable Y, the amount in …

Learn what random sampling is and understand its definition and types. Discover examples of random sampling and see how random sampling is useful in statistics.

Learn about representative samples. Study representative sample examples and discover how to get an accurate representative sample for a survey or experiment.

Learn how to calculate the variance of the difference of two independent discrete random variables, and see examples that walk through sample problems step-by-step for you to …