7th Edition

ISBN: 9780135901021

Author: Larson

Publisher: PEARSON EDUCATION (COLLEGE)

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Chapter 8, Problem 5CR

In Exercises 3–6, construct the indicated confidence interval for the population mean μ. Which distribution did you use to create the confidence interval?

5. c = 0.99, x ¯ = 12.1 , s = 2.64. n = 26

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 4CR

Chapter 8, Problem 6CR

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Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.12 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below. Click the icon to view the data table. - Data table (a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990. Ho: P = 0.12 mg/L H₁: μ # 0.12 mg/L 0.074 0.075 0.071 0.257 0.116 0.177 0.107 0.247 0.333 0.102 (b) Construct a 90% confidence interval about the sample mean concentration of calcium precipitation. The lower bound is The upper bound is Print (Round to four decimal places as needed.) Done X

The confidence level is 90%

Chapter 8 Solutions

MYLAB STATISTICS: ELEMENTARY STATISTICS

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In Exercises 3–6, construct the indicated confidence interval for the population mean μ . Which distribution did you use to create the confidence interval? 5. c = 0.99, x ¯ = 12.1 , s = 2.64. n = 26

Solution Summary: The author explains how the t -distribution should be used to construct a 99% confidence interval for the population mean.

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