close solutoin list

Automobile insurance is much more expensive for teenage drivers than for older drivers. To justify this cost difference, insurance companies claim that the younger drivers are much more likely to be involved in costly accidents. To test this claim, a researcher obtains information about registered drivers from the department of motor vehicles and selects a sample of n = 300 accident reports from the police department. The motor vehicle department reports the percentage of registered drivers in each age category as follows: 16% are younger than age 20; 28% are 20 to 29 years old; and 56% are age 30 or older. The number of accident reports for each age group is as follows: Under Age Age Age 30 or 20 20-28 Older 68 92 140 a. Do the data indicate that the distribution of accidents for the three age groups is significantly different from the distribution of drivers? Test with α = .05. b. Compute Cohen's w to measure the size of the effect. c. Write a sentence demonstrating how the outcome of the hypothesis test and the measure of effect size would appear in a research report.

BuyFind

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570
BuyFind

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
Publisher: Cengage Learning
ISBN: 9781133956570

Solutions

Chapter
Section
Chapter 15, Problem 8P
Textbook Problem

Automobile insurance is much more expensive for teenage drivers than for older drivers. To justify this cost difference, insurance companies claim that the younger drivers are much more likely to be involved in costly accidents. To test this claim, a researcher obtains information about registered drivers from the department of motor vehicles and selects a sample of n = 300 accident reports from the police department. The motor vehicle department reports the percentage of registered drivers in each age category as follows: 16% are younger than age 20; 28% are 20 to 29 years old; and 56% are age 30 or older. The number of accident reports for each age group is as follows:

Under Age Age Age 30 or
20 20-28 Older
68 92 140

a. Do the data indicate that the distribution of accidents for the three age groups is significantly different from the distribution of drivers? Test with α = .05.

b. Compute Cohen's w to measure the size of the effect.

c. Write a sentence demonstrating how the outcome of the hypothesis test and the measure of effect size would appear in a research report.

Expert Solution

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

See Solution

*Response times vary by subject and question complexity. Median response time is 34 minutes and may be longer for new subjects.

Chapter 15 Solutions

Essentials of Statistics for the Behavioral Sciences
Show all chapter solutions

Additional Math Textbook Solutions

Find more solutions based on key concepts
Show solutions
Find the constants m and b in the linear function f(x) = mx + b such that f(2) = 4 and the straight line repres...

Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach

In Exercises 15-22, find the equation of the specified line. Through (1,3) and (5,2)

Finite Mathematics and Applied Calculus (MindTap Course List)

True or False: If converges absolutely, then it converges conditionally.

Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th

True or False: converges.

Study Guide for Stewart's Multivariable Calculus, 8th

Express the number 0.253/2 as a decimal.

Mathematics For Machine Technology

U.S. Border Crossings. The Bureau of Transportation Statistics keeps track of all border crossings through port...

Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)

Horizontal Distance from Height and Slope A ladder leans against a wall so that its slope is 1.75. The top of t...

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)

In Problems 2326 verify that the indicated function is an explicit solution of the given differential equation....

A First Course in Differential Equations with Modeling Applications (MindTap Course List)