# Question: Test the validity of the equal variance assumption in problem 8 27 In

Test the validity of the equal-variance assumption in problem 8-27.

In problem The cosmetics giant Avon Products recently hired a new advertising firm to promote its products. Suppose that following the airing of a random set of 8 commercials made by the new firm, company sales rose an average of 3% and the standard deviation was 2%. For a random set of 10 airings of commercials by the old advertising firm, average sales rise was 2.3% and the standard deviation was 2.1%. Is there evidence that the new advertising firm hired by Avon is more effective than the old one? Explain.

In problem The cosmetics giant Avon Products recently hired a new advertising firm to promote its products. Suppose that following the airing of a random set of 8 commercials made by the new firm, company sales rose an average of 3% and the standard deviation was 2%. For a random set of 10 airings of commercials by the old advertising firm, average sales rise was 2.3% and the standard deviation was 2.1%. Is there evidence that the new advertising firm hired by Avon is more effective than the old one? Explain.

**View Solution:**## Answer to relevant Questions

Test the validity of the equal-variance assumption for the data presented in problem 8-25. In problem Mark Pollard, financial consultant for Merrill Lynch, Pierce, Fenner & Smith, Inc., is quoted in national advertisements ...According to Money, the average cost of repairing a broken leg is $10,402, and the average cost of repairing a knee injury is $11,359.12 Assume that these two statistics are sample averages based on two independent random ...According to the New York Times, the average number of roses imported to the United States from Costa Rica is 1,242 per month, while the average number imported from Guatemala each month is 1,240.14 Assume that these two ...The power of supercomputers derives from the idea of parallel processing. Engineers at Cray Research are interested in determining whether one of two parallel processing designs produces faster average computing time, or ...In problem 8–4, suppose that the population standard deviation is 1.0 and that the true average reduction in consumption for the entire population in the area is μD = 0.1. For a sample size of 60 and α = 0.01, what is ...Post your question