A consumer group tested two brands of inkjet printer cartridges for a particular printer to see whether there was a difference in the number of pages produced before the cartridge ran out of ink. The printers were tested in a random sample of offices where they were used for printing invoices. Brand A cartridges produced an average of 862 pages, with a standard deviation of 362, for a sample size of 31. Brand B cartridges produced an average of 731 pages, with a standard deviation of 223, for a sample size of 25. Is there evidence of a difference in the number of pages produced by the two brands of cartridges? Use α = 5%. You may assume that the sample data appear normally distributed.
Answer to relevant QuestionsConstruct a 90% confidence interval estimate for the difference in the number of pages produced by the two different cartridges described in Exercise 14 above. In exercise A consumer group tested two brands of inkjet printer ...Suppose you are conducting a Wilcoxon Rank Sum Test to determine if population 1 is to the right of population 2. You have two samples of size 10. W1 = 78. What does this tell you? A large accounting firm is concerned about the amount of time its managers spend dealing with email. A random sample of 27 managers taken in the past revealed that they spent, on average, 49.2 minutes per day on email, with ...Refer to your analysis for Develop Your Skills 11.2, Exercise 8 (page 420). How do the salaries of each stream of the business diploma program compare, five years after graduation? A commuter is trying to figure out the fastest way to drive to work in the morning. She keeps track of the times (in minutes) for three different routes on a random sample of mornings. Her records are shown in Exhibit ...
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