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Chapter 8: Q. 71 (page 519)

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

Short Answer

Expert verified

The Normal requirement to use the t-procedure is thus not required.

Step by step solution

01

Given Information

02

Explanation

In the box plot we note that there are 3outliers and the distribution appears to be left-skewed (since the line in the box of the boxplot is more to the right of the box).

Since the distribution contains outliers and skewness, the distribution is NOT approximately a normal distribution.

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