Applied Statistics in Business and Economics

5th Edition

ISBN: 9780077837303

Author: David Doane, Lori Seward Senior Instructor of Operations Management

Publisher: McGraw-Hill Education

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Textbook Question

Chapter 8, Problem 79CE

How “decaffeinated” is decaffeinated coffee? If a researcher wants to estimate the mean caffeine content of a cup of Starbucks’ decaffeinated espresso with 98 percent confidence and an error of ±0.1 mg, what is the required number of cups that must be tested? Assume a standard deviation of 0.5 mg, based on a small preliminary sample of 12 cups.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 8, Problem 78CE

Chapter 8, Problem 80CE

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Chapter 8 Solutions

Applied Statistics in Business and Economics

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Solution Summary: The author calculates the required number of cups that must be tested with 98% confidence and an error of pm 0.1 mg.

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