10.47 You are the product manager for brand 4 in a large food company. The company president...

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10.47 You are the product manager for brand 4 in a large food company. The company president has complained that a competing brand, called brand 2, has higher average sales. The data services group has stored the latest product sales (saleb2 and saleb4) and price data (apriceb2 and apriceb4) in a file named Storet described in Chapter 10 appendix.

a. Based on a statistical hypothesis test, does the president have strong evidence to support her complaint?

Show all statistical work and reasoning.

b. After analyzing the data, you note that a large outlier of value 971 is contained in the sample for brand 2. Repeat part a with this extreme observation removed. What do you now conclude about the president’s complaint?

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Essential Mathematics And Statistics For Science

ISBN: 9780470694480

2nd Edition

Authors: Graham Currell, Dr. Antony Dowman

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