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Description: In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6976 subjects randomly selected from an online group involved with ears. There were 1296 surveys returned. Use a 0.01 significance level to test the

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6976 subjects randomly selected from an online group involved with ears. There were 1296 surveys returned. Use a 0.01 significance level to test the claim that the return rate is less than 20%. Use the P-value method and use the normal distribution as an approximation to the binomial distribution.

Identify the null hypothesis and alternative hypothesis.

A. H0: p=0.2 H1: p≠0.2

B. H0: p>0.2 H1: p=0.2

C. H0: p=0.2 H1: p<0.2

D. H0: p<0.2 H1: p=0.2

E. H0: p≠0.2 H1: p=0.2

F. H0: p=0.2 H1: p>0.2

The test statistic is

z= ____

(Round to two decimal places as needed.)

The P-value is ____.

(Round to three decimal places as needed.)

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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