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21. In the coefficient of variation formula below, what does the (S) stand for?

22. A normally distributed data should approximate the theoretical normal distribution. What is the interquartile range of a normal distribution?

23. According to a national grocery store chain manager, only 6% of consumers who have surveys mailed to their homes return them filled out completely. What is this type of sampling error called?

24. A company wishes to compare the expected mileage of eight different types of car tires. Which of the following statistical tests is best suited for the analysis?

25. Machines A and B have been showing disparate efficiency and defects per unit rates despite similar variation in quality at purchase time. If the mean squares between the two machines is 250 and the mean squares from each machine 100, what is the value of the FSTAT?