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# Pulling wood apart How heavy a load (pounds) is needed to pull apart pieces of Douglas

ISBN: 9781464108730 488

## Solution for problem 57 Chapter 8.3

The Practice of Statistics | 5th Edition

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Problem 57

Pulling wood apart How heavy a load (pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? A random sample of 20 similar pieces of Douglas fir from a large batch was selected for a science class. The Fathom boxplot below shows the classs data. Explain why it would not be wise to use a t critical value to construct a confidence interval for the population mean m.

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Week 2 Being mathematically precise about describing quantitative value distribution Measuring center: MEAN - Mean: the arithmetic average The sample mean, which is a statistic, is denoted by X´ (“ex- bar”): X +X +…+X ∑ X X= 1 2 = i n n where n is the sample size - The population mean, which is a parameter, is denoted by μ (“mu”): x1+x...

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