Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

In the Dallas, some fire trucks were painted yellow (instead of the red colour) to heighten their visibility. Throughout a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At α = .01, did the yellow fire trucks have the significantly lower accident rate?

(a) State hypotheses.

(b) State decision rule and sketch it.  

(c) Find out the sample proportions and test statistic.   

(d) Make a decision.

(e) Find out the p-value and interpret it.  

(f ) If statistically significant, do you think the difference is large enough to be significant? If so, to whom, and why?

(g) Is the normality assumption fulfilled? Describe.

Source: The Wall Street Journal, June 26, 1995, p. B1.

Accident Rate for Dallas Fire Trucks

Statistic                                   Red Fire Trucks                       Yellow Fire Trucks

Number of accidents              x1 = 20 accidents                    x2 = 4 accidents

Number of fire runs                n1 = 153,348 runs                   n2 = 135,035 runs

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M921334

Have any Question? 


Related Questions in Statistics and Probability

Consider the three alternative allocations of money m in an

Consider the three alternative allocations of money (m) in an economy composed of three people, with people labeled A, B, C, and alternative allocations labeled X, Y, Z. The values in the 9 cells are the moneys accruing ...

A manufacturer claims that fewer than 6 of its fax machines

A manufacturer claims that fewer than 6% of its fax machines are defective. In a random sample of 240 such fax machines, 12 are defective. A) Find the sample portion of defective fax machine B) Find the critical Z value ...

1 should demand characteristics be eliminated or

1. Should demand characteristics be eliminated or strengthened in an experiment? Explain. 2. How do researchers detect and eliminate placebo effects? 3. What effect does error variance have on the results of an experimen ...

You are interested in using linear regression to test

You are interested in using linear regression to test whether drinking a protein shake improves weightlifting performance. From a sample of 200 college students, you estimate a linear regression with WEIGHTLIFT as the de ...

The department of education would like to determine if

The Department of Education would like to determine if there are gender differences in the performance of twins on the state mandated mathematics examination. As a result, they have collected data on twelve sets of twins ...

1 what are the most common causes of missing data and what

1. What are the most common causes of missing data, and what difficulties do missing data cause? What can be done if data are missing? 2. Comment on the circumstances under which a researcher would consider deleting one ...

Measures of central tendency summative taskon a separate

Measures of Central Tendency Summative Task On a separate paper hand out the solution of the two parts of the investigation: Part One - Use the given data set to solve the following problems: 50, 55, 60, 60,70, 80 A. Fin ...

If 2 of the calls received by schools switchboard are wrong

If 2% of the calls received by schools switchboard are wrong numbers. Find the probability that among 210 calls received by schools switchboard, 4 will be wrong numbers. a). Determine in this case whether the conditions ...

Research objectives to explore correlations between reward

Research Objectives To explore correlations between reward systems and team work attributes in the Saudi Arabian bank sector To explore relationships between reward systems and team work effectiveness in the Saudi Arabia ...

Pretend we are playing a coin-tossing game we will toss 100

Pretend we are playing a coin-tossing game. We will toss 100 pennies (all distinguishable) into the air, and there is an equal chance they will land on the table or on the floor. What is the dimensionless entropy associa ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen