/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q. 69 A study of road rage asked sampl... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 10: Q. 69 (page 659)

A study of road rage asked samples of 596men and 523women about their behaviour while driving. Based on their answers, each person was assigned a road rage score on a scale of 0to20. The participants were chosen by random digit dialling of telephone numbers. We suspect that men are more prone to road rage than women. To see if this is true, test these hypotheses for the mean road rage scores of all male and female drivers

(a) H0:渭M=渭FversusH0:渭M>渭F

(b) H0:渭M=渭FversusH0:渭M鈮�渭F

(c) role="math" localid="1650363760526" H0:渭M=渭FversusH0:渭M<渭F

(d) H0:x炉M=x炉FversusH0:x炉M>x炉F

(e)H0:x炉M=x炉FversusH0:x炉M<xF

Short Answer

Expert verified

The answer is option (a)H0:渭M=渭F,H0:渭M>渭F

Step by step solution

01

Given information

A study of road rage samples

Men is596

Women is 523

It is suspected that men are more prone to road rage than women and see if this is true.

02

Explanation 

The hypothesis are claims that are made concerning a population parameter (s).

The population mean渭an is the population parameter.

According to the null hypothesis, the two population parameters are equal:

H0:渭M=渭F

According to the claim, the alternative hypothesis expresses the polar opposite of the null hypothesis. Men are more prone to road rage than women, according to the claim:

H0:渭M>渭F, so it is option (a).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Golf club repairs The Ping Company makes custom-built golf clubs and competes in the $4billion golf equipment industry. To improve its business process, Ping decided to study the time it took to repair golf clubs sent to the company by mail. The company determined that 16%of a random sample of orders were sent back to the customers in 5days or less. Ping examined the processing of repair orders and made changes. Following the changes, 90%of a random sample of orders were completed within 5days. Assume that each of the estimated percent is based on a random sample of n orders.

(a) We used the sample data to construct two 90% confidence intervals for the proportion of orders completed within 5 days-one before and one after the changes at Ping. The two intervals are (0.858,0.942) and (0.109,0.211). Find the value of n.

(b) Explain why the interval (0.858-0.211,0.942-0.109)=(0.647,0.833) is not a 95% confidence interval for the improvement in the proportion of orders sent back to customers within 5 days following the change.

(c) Construct and interpret a correct 95% confidence interval to replace the one in part (b).

Computer gaming Do experienced computer game players earn higher scores when they play with someone present to cheer them on or when they play alone? Fifty teenagers who are experienced at playing a particular computer game have volunteered for a study . We randomly assign 25of them to play the game alone and the other 25to play the game with a supporter present. Each player鈥檚 score is recorded.

(a) Is this a problem with comparing means or comparing proportions? Explain.

(b) What type of study design is being used to produce data?

Final grades for a class are approximately Normally distributed with a mean of 76and a standard deviation of 8. A professor says that the top 10%of the class will receive an A, the next 20%a B, the next 40%a C, the next 20%a D, and the bottom 10%an F. What is the approximate maximum average a student could attain and still receive an F for the course?

(a) 70

(b)69.27

(c) 65.75

(d) 62.84

(e)57

T10.11. Researchers wondered whether maintaining a patient's body temperature close to normal by heating the patient during surgery would affect wound infection rates. Patients were assigned at random to two groups: the normothermic group (patients' core temperatures were maintained at near normal, 36.5掳C, with heating blankets) and the hypothermic group (patients" core temperatures were allowed to decrease to about34.5掳C). If keeping patients warm during surgery alters the chance of infection, patients in the two groups should have hospital stays of very different lengths. Here are summary statistics on hospital stay (in number of days) for the two groups:

Groupnx炉sxNormothemic10412.14.4Hypothermic9614.76.5

(a) Construct and interpret a 95%confidence interval for the difference in the true mean length of hospital stay for normothermic and hypothermic patients.

(b) Does your interval in part (a) suggest that keeping patients warm during surgery affects the average length of patients' hospital staves? Justify your answer.

DDT in rats Poisoning by the pesticide DDT causes convulsions in humans and other mammals. Researchers seek to understand how convulsions are caused. In a randomized comparative experiment, they compared 6 white rats poisoned with DDT with a control group of 6 unpoisoned rats. Electrical measurements of nerve activity are the main clue to the nature of DDT poisoning. When a nerve is stimulated, its electrical response shows a sharp spike followed by a much smaller second spike. The researchers measured the height of the second spike as a percent of the first spike when a nerve in the rat's leg was stimulated. 78 For the poisoned rats the results were

12.20716.86925.05022.4298.45620.589

The control group data were

11.0749.68612.0649.3518.1826.642

Computer output for a two-sample t-test on these data from software is shown below. (Note that SAS provides two-sided P-values.)

(a) Do these data provide convincing evidence that DDT affects the mean height of the second spike's electrical response? Carry out a significance test to help answer this question.

(b) Interpret the P-value from part (a) in the context
See all solutions

Recommended explanations on Math Textbooks

Calculus

Read Explanation

Mechanics Maths

Read Explanation

Probability and Statistics

Read Explanation

Discrete Mathematics

Read Explanation

Statistics

Read Explanation

Logic and Functions

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.