Understandable Statistics: Concepts and Methods
Understandable Statistics: Concepts and Methods
12th Edition
ISBN: 9781337119917
Author: Charles Henry Brase, Corrinne Pellillo Brase
Publisher: Cengage Learning
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Chapter 11.4, Problem 6P

(a)

To determine

Find the level of significance.

State the null and alternative hypothesis.

(b)

To determine

Find the sample test statistic R, the number of runs.

(c)

To determine

Find the lower critical value.

Find the upper critical value.

(d)

To determine

Mention the conclusion of the test.

(e)

To determine

Interpret the conclusion in the context of the application.

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A biologist is investigating the effect of potential plant hormones by treating 20 stem segments. At the end of the observation period he computes the following length averages: Compound X = 1.18 Compound Y = 1.17 Based on these mean values he concludes that there are no treatment differences. 1) Are you satisfied with his conclusion? Why or why not? 2) If he asked you for help in analyzing these data, what statistical method would you suggest that he use to come to a meaningful conclusion about his data and why? 3) Are there any other questions you would ask him regarding his experiment, data collection, and analysis methods?
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Understandable Statistics: Concepts and Methods

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