8th Edition

ISBN: 9781337558075

Author: Charles Henry Brase, Corrinne Pellillo Brase

Publisher: Cengage Learning

Concept explainers

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Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow compar…

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Textbook Question

100%

Chapter 8.2, Problem 13P

In Problems 13-19. assumethat the population of x values has an approximately normal distribution.

Archaeology: Tree Rings At Burnt Mesa Pueblo, the method of tree-ring dating gave the following years a.d. for an archaeological excavation site (Bandelier Archaeological Excavation Project: Summer 1990 Excavations at Burnt Mesa Pueblo, edited by Kohler. Washington State University):

1189 1271 1267 1272 1268 1316 1275 1317 1275

(a) Use a calculator with mean and standard deviation keys to verify that the sample mean year is x ¯ ≈ 1272 , with sample standard deviation

s ≈ 37 years.

(b) Find a 90% confidence interval for the mean of all tree-ring dates from this archaeological site.

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 Solutions

Understanding Basic Statistics

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Solution Summary: The author explains how to find a 90% confidence interval for the mean of all tree-ring dates from this archaeological site.

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Chapter 8 Solutions