Essentials Of Statistics For Business & Economics
9th Edition
ISBN: 9780357045435
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: South-Western College Pub
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Textbook Question
Chapter 12.3, Problem 24E
Traffic Accidents by Day of Week. The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of the week. Assume that a sample of 420 accidents provided the following data.
- a. Conduct a hypothesis test to determine if the proportion of traffic accidents is the same for each day of the week. What is the p-value? Using a .05 level of significance, what is your conclusion?
- b. Compute the percentage of traffic accidents occurring on each day of the week. What day has the highest percentage of traffic accidents? Does this seem reasonable? Discuss.
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Examine the Variables: Carefully review and note the names of all variables in the dataset. Examples of these variables include:
Mileage (mpg)
Number of Cylinders (cyl)
Displacement (disp)
Horsepower (hp)
Research: Google to understand these variables.
Statistical Analysis: Select mpg variable, and perform the following statistical tests. Once you are done with these tests using mpg variable, repeat the same with hp
Mean
Median
First Quartile (Q1)
Second Quartile (Q2)
Third Quartile (Q3)
Fourth Quartile (Q4)
10th Percentile
70th Percentile
Skewness
Kurtosis
Document Your Results:
In RStudio: Before running each statistical test, provide a heading in the format shown at the bottom. “# Mean of mileage – Your name’s command”
In Microsoft Word: Once you've completed all tests, take a screenshot of your results in RStudio and paste it into a Microsoft Word document. Make sure that snapshots are very clear. You will need multiple snapshots. Also transfer these results to the…
Examine the Variables: Carefully review and note the names of all variables in the dataset. Examples of these variables include:
Mileage (mpg)
Number of Cylinders (cyl)
Displacement (disp)
Horsepower (hp)
Research: Google to understand these variables.
Statistical Analysis: Select mpg variable, and perform the following statistical tests. Once you are done with these tests using mpg variable, repeat the same with hp
Mean
Median
First Quartile (Q1)
Second Quartile (Q2)
Third Quartile (Q3)
Fourth Quartile (Q4)
10th Percentile
70th Percentile
Skewness
Kurtosis
Document Your Results:
In RStudio: Before running each statistical test, provide a heading in the format shown at the bottom. “# Mean of mileage – Your name’s command”
In Microsoft Word: Once you've completed all tests, take a screenshot of your results in RStudio and paste it into a Microsoft Word document. Make sure that snapshots are very clear. You will need multiple snapshots. Also transfer these results to the…
Chapter 12 Solutions
Essentials Of Statistics For Business & Economics
Ch. 12.1 - Use the sample data below to test the...Ch. 12.1 - reconsider the observed frequencies in exercise 1...Ch. 12.1 - Late Flight Comparison Across Airlines. The sample...Ch. 12.1 - Electronic Component Supplier Quality Comparison....Ch. 12.1 - Research Classification of Higher Education. The...Ch. 12.1 - Error Rates in Tax Preparation. A tax preparation...Ch. 12.1 - Use of Social Media. Social media is becoming more...Ch. 12.1 - Supplier Quality: Three Inspection Outcomes. The...Ch. 12.2 - The following table contains observed frequencies...Ch. 12.2 - The following table contains observed frequencies...
Ch. 12.2 - Airline Ticket Purchases for Domestic and...Ch. 12.2 - Hiring and Firing Plans at Private and Public...Ch. 12.2 - Generational Differences in Workplace Attitudes....Ch. 12.2 - Vehicle Quality Ratings. A J. D. Power and...Ch. 12.2 - Company Reputation and Management Quality Survey....Ch. 12.2 - Academy Awards and Movie Fan Sentiment. The race...Ch. 12.2 - Amount of Sleep by Age Group. The National Sleep...Ch. 12.2 - Prob. 18ECh. 12.3 - Test the following hypotheses by using the 2...Ch. 12.3 - The following data are believed to have come from...Ch. 12.3 - Television Audiences Across Networks. During the...Ch. 12.3 - M&M Candy Colors. Mars, Inc. manufactures M&M’s,...Ch. 12.3 - Shareholder Scoreboard Ratings. The Wall Street...Ch. 12.3 - Traffic Accidents by Day of Week. The National...Ch. 12.3 - Daily High Temperatures. Bob Feller, an Iowa...Ch. 12.3 - Weekly Demand at Whole Foods Market. The manager...Ch. 12 - Where Millionaires Live in America. In a 2018...Ch. 12 - Quality Comparison Across Production Shifts....Ch. 12 - Ratings of Most-Visited Art Museums. As listed by...Ch. 12 - Pace-of-Life Preference By Gender. A Pew Research...Ch. 12 - Church Attendance by Age Group. The Barna Group...Ch. 12 - Ambulance Calls by Day of Week. An ambulance...Ch. 12 - Attitudes Toward New Nuclear Power Plants. A...Ch. 12 - America’s Favorite Sports. The Harris Poll tracks...Ch. 12 - Best-Selling Small Cars in America. Based on 2017...Ch. 12 - Prob. 36SECh. 12 - Testing If Daily Sales Obey a Binomial Probability...Ch. 12 - In a study conducted by Zogby International for...Ch. 12 - Six months ago, Fuentes Salty Snacks, Inc., added...Ch. 12 - Fresno Board Games manufactures and sells several...
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- Examine the Variables: Carefully review and note the names of all variables in the dataset. Examples of these variables include: Mileage (mpg) Number of Cylinders (cyl) Displacement (disp) Horsepower (hp) Research: Google to understand these variables. Statistical Analysis: Select mpg variable, and perform the following statistical tests. Once you are done with these tests using mpg variable, repeat the same with hp Mean Median First Quartile (Q1) Second Quartile (Q2) Third Quartile (Q3) Fourth Quartile (Q4) 10th Percentile 70th Percentile Skewness Kurtosis Document Your Results: In RStudio: Before running each statistical test, provide a heading in the format shown at the bottom. “# Mean of mileage – Your name’s command” In Microsoft Word: Once you've completed all tests, take a screenshot of your results in RStudio and paste it into a Microsoft Word document. Make sure that snapshots are very clear. You will need multiple snapshots. Also transfer these results to the…arrow_forward2 (VaR and ES) Suppose X1 are independent. Prove that ~ Unif[-0.5, 0.5] and X2 VaRa (X1X2) < VaRa(X1) + VaRa (X2). ~ Unif[-0.5, 0.5]arrow_forward8 (Correlation and Diversification) Assume we have two stocks, A and B, show that a particular combination of the two stocks produce a risk-free portfolio when the correlation between the return of A and B is -1.arrow_forward
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