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Questions and Answers of Business Statistics

The article ?Rapid Evolutionary Response to a Transmissible Cancer in Tasmanian Devils? (nature .com/articles/ncomms12684, retrieved December 20, 2016) describes the spread of devil facial tumor
Use the information given in the previous exercise to calculate a 95% bootstrap confidence interval to estimate the mean difference in movement, OFF ? CL. Interpret the interval in context. You can
New ?closed loop? (CL) devices have been developed to help to suppress overactive brain activity in patients with conditions such as Parkinson?s disease and epilepsy (?Conceptualization and
Use the information in the previous exercise to construct a 95% bootstrap confidence interval to estimate the difference in mean 1-year improvement in ADHD Severity Score for the ONTRAC treatment and
A new set of cognitive training modules called ONTRAC was developed to help children with attention deficit hyperactivity disorder (ADHD) to improve focus and to more easily dismiss distractions
Use the information in the previous exercise to construct a 95% bootstrap confidence interval to estimate the difference in mean Personal Meaning scores for patients with cancer in the high-dose and
Studies have been conducted to evaluate the effectiveness of psilocybin mushrooms on improving the quality of life for patients with cancer (?A Dose of a Hallucinogen from a ?Magic Mushroom,? and
Use the information given in the previous exercise to construct a 95% bootstrap confidence interval to estimate the difference in mean average working heart rates for the driver in teams of two
The Sheboygan (Wisconsin) Fire Department received a report on the potential effects of reductions in the number of firefighters it employs (?Study of Fire Department Causes Controversy,? USA TODAY
Gallup surveyed adult Americans about their consumer debt (“Americans’ Big Debt Burden Growing, Not Evenly Distributed,” February 4, 2016, gallup.com, retrieved December 15, 2016). The article
A Harris Poll press release dated November 1, 2016, summarized results of a survey of 2463 adults and 510 teens age 13 to 17 (“American Teens No Longer More Likely than Adults to Believe in God,
A survey of high school students is described in the report “Students on STEM” (changetheequation. org/students-stem, retrieved December 12, 2016). The report states that 14% of those in a sample
The report “The New Food Fights: U.S. Public Divides Over Food Science” (December 1, 2016, pewinternet.org, retrieved December 10, 2016) states that younger adults are more likely to see
The Bureau of Labor Statistics report referenced in the previous exercise also indicated that 7.3% of high school graduates were unemployed in October 2013 and 5.7% of high school graduates were
The Bureau of Labor Statistics (bls.gov/opub /ted/2014/ted_20141112.htm, retrieved December 13, 2016) reported that 3.8% of college graduates were unemployed in October 2013 and 3.1% of college
The report “Raising Kids and Running a Household: How Working Parents Share the Load” (November 4, 2015, Pew Research Center, pewresearch.org, retrieved December 12, 2016) described a survey of
According to the U.S. Census Bureau, the percentage of U.S. residents living in poverty in 2015 was 12.2% for men and 14.8% for women. These percentages were estimates based on data from large
The article referenced in the previous exercise also reported that 53% of the Republicans surveyed indicated that they were opposed to making women register for the draft. Would you use the
The article “Most Women Oppose Having to Register for the Draft” (February 10, 2016, rasmussenreports.com, retrieved December 15, 2016) describes a survey of likely voters in the United States.
The report titled “Digital Democracy Survey” (2016, deloitte.com/us/tmttrends, retrieved December 16, 2016) stated that 31% of the people in a representative sample of adult Americans ages 33 to
Some people seem to believe that you can fix anything with duct tape. Even so, many were skeptical when researchers announced that duct tape may be a more effective and less painful alternative than
Use the information given in the previous exercise to construct and interpret a 95% confidence interval for the difference in mean following distance for Greek taxi drivers while driving with no
The paper referenced in the previous exercise also had the 50 taxi drivers drive in the simulator while sending and receiving text messages. The mean of the 50 sample differences (no distraction –
The paper “Driving Performance While Using a Mobile Phone: A Simulation Study of Greek Professional Drivers” (Transportation Research Part F [2016]: 164–170) describes a study in which 50 Greek
The paper referenced in the previous exercise also compared the reported heights and weights to actual measured heights and weights for a sample of 1052 female college students selected from eight
The authors of the paper “Concordance of Self- Report and Measured Height and Weight of College Students” (Journal of Nutrition, Education and Behavior [2015]: 94–98) used a paired-samples t
The article “Puppy Love? It’s Real, Study Says” (USA TODAY, April 17, 2015) describes a study into how people communicate with their pets. The conclusion expressed in the title of the article
In Exercise 11.23, a hypothesis test leads to the conclusion that there is not convincing evidence that the mean time to exhaustion for experienced triathletes is greater when they run while
The study described in the previous exercise also measured time to exhaustion for the 11 triathletes on a day when they listened to music that the runners had classified as neutral as compared to
Many runners believe that listening to music while running enhances their performance. The authors of the paper ?Effects of Synchronous Music on Treadmill Running Among Elite Triathletes? (Journal of
The authors of the paper “The Empowering (Super) Heroine? The Effects of Sexualized Female Characters in Superhero Films on Women” (Sex Roles [2015]: 211–220) were interested in the effect of
The paper “Does the Color of the Mug Influence the Taste of the Coffee?” (Flavour [2014]: 1–7) describes an experiment in which subjects were assigned at random to one of two treatment groups.
Internet addiction has been described as excessive and uncontrolled Internet use. The authors of the paper “Gender Difference in the Relationship Between Internet Addiction and Depression”
The authors of the paper “Influence of Biofeedback Weight Bearing Training in Sit to Stand to Sit and the Limits of Stability on Stroke Patients” (The Journal of Physical Therapy Science [2016]:
Use the information in the previous exercise to answer the following questions.a. Construct a 95% confidence interval estimate of the difference in mean time spent on Facebook for male college
The paper “Facebook Use and Academic Performance Among College Students: A Mixed- Methods Study with a Multi-Ethnic Sample” (Computers in Human Behavior [2015]: 265–272) describes a survey of a
The report referenced in the previous exercise also gave data for representative samples of 250 adults in Canada and in England. The sample mean amount of sleep on a work night was 423 minutes for
The National Sleep Foundation surveyed representative samples of adults in six different countries to ask questions about sleeping habits (“2013 International Bedroom Poll Summary of Findings,”
Use the information in the previous exercise to answer the following questions.a. Construct a 90% confidence interval estimate of the difference in mean Flesch reading ease score for health-related
Many people now turn to the Internet to get information on health-related topics. The paper “An Examination of Health, Medical and Nutritional Information on the Internet: A Comparative Study of
The article “Facebook Use and Academic Performance Among College Students” (Computers in Human Behavior [2015]: 265–272) estimated that 87% percent of students at a large public university in
In a representative sample of adult Americans age 26 to 32 years, 27% indicated that they owned a fitness band that kept track of the number of steps walked each day and their daily activity levels
According to a large national survey conducted by the Pew Research Center (“What Americans Think About NSA Surveillance, National Security and Privacy,” May 2, 2015, pewresearch.org, retrieved
USA TODAY reported that Americans spend 4.1 hours per weekday checking work email (October 14, 2016). This was an estimate based on a survey of 1004 white-collar workers in the United States.a.
People in a random sample of 236 students enrolled at a liberal arts college were asked questions about how many hours of sleep they get each night (“Alcohol Consumption, Sleep, and Academic
The authors of the paper “Mean Platelet Volume Could Be Possible Biomarker in Early Diagnosis and Monitoring of Gastric Cancer” (Platelets [2014]: 592–594) wondered if mean platelet volume
The report “A Crisis in Civic Education” (American Council of Trustees and Alumni, January 2016, goacta.org/images/download/A_Crisis_in_Civic _Education.pdf, retrieved November 30, 2016)
Major League Baseball (MLB) includes two groups of teams, in two ?leagues.? There are 15 teams in each of the American League (AL) and the National League (NL). Since 1997, teams in each of the
Researchers studied ergometer (rowing machine) times for international male competitors in the 2007 World Junior Rowing Championships. They found that the mean time to row 2000 meters on an ergometer
Teams in the National Football League (NFL) are given a ?bye? during 1 week of the season, when they can rest and not play a game. This may provide an advantage for the team in the next game they
Example 10.13 provided the following 21 time discrimination scores for male smokers who had abstained from smoking for 24 hours. a. What characteristic of the sample size indicates that the methods
The dodo was a species of flightless bird that lived on the island of Mauritius in the Indian Ocean. The first record of human interaction with the dodo occurred in 1598, and within 100 years the
At one point during the 2015 NFL season, head coach Bill Belichick and the New England Patriots had won 19 of their past 25 called coin flips at the beginning of NFL games (?For Bill Belichick,
Data from a large study carried out in 2008 were used to estimate that 10% of all smokers who quit smoking are smoking again after 1 year (“Relapse to Smoking After 1 Year of Abstinence: A
A sample of dogs were trained using a ?Do as I do? method, in which the dog observes the trainer performing a simple task (such as climbing onto a chair or touching a chair) and is expected to
A study of hospitalized patients who develop pneumonia reported that 1 in 5 (20%) are readmitted to the hospital within 30 days after discharge (“Comparison of Therapist-Directed and Physician-
We are only beginning to learn about the longterm effects of space travel on human health. A study published in 2016 (Nature Scientific Reports 6,Article number: 29901, nature.com/articles?
Consider the water temperature situation described in the previous exercise. a. For the hypotheses and test procedure described in the previous exercise, calculate the value of b when ? = 153. b. For
The power of a test is influenced by the sample size and the choice of significance level.a. Explain how increasing the sample size affects the power (when significance level is held fixed).b.
In a study of media use, each person in a large representative sample of male Canadian high school students was asked how much time they spent playing video or computer games (in minutes per day).
The authors of the paper “Changes in Quantity, Spending, and Nutritional Characteristics of Adult, Adolescent and Child Urban Corner Store Purchases After an Environmental Intervention”
The report “Majoring in Money: How American College Students Manage Their Finances” (Sallie Mae, 2016, news/salliemae.com, retrieved December 24, 2016) includes data from a survey of college
The Economist collects data each year on the price of a Big Mac in various countries around the world. The price of a Big Mac for a sample of McDonald?s restaurants in Europe in July 2016 resulted in
The report “2016 Salary Survey Executive Summary” (National Association of Colleges and Employers, naceweb.org/uploadedfiles/files/2016 /publications /executive
The United States Elections Project (electproject .org/2016g, retrieved January 22, 2017) reported that 57.8% of registered voters in California voted in the 2016 presidential election and that this
The article “Public Acceptability in the UK and the USA of Nudging to Reduce Obesity: The Example of Reducing Sugar-Sweetened Beverages” (PLOS One, June 8, 2016) describes a survey in which each
The article “How to Block Nuisance Calls” (The Guardian, November 7, 2015) reported that in a survey of mobile phone users, 70% of those surveyed said they had received at least one nuisance call
The report “Digital Democracy Survey” (DeloitteDevelopment LLC, 2016, deloitte.com/us/en .html, retrieved November 30, 2016) says that 69% of U.S. teens access the social media from a
The article “Euthanasia Still Acceptable to Solid Majority in U.S.” (gallup.com, June 24, 2016, retrieved November 29, 2016) summarized data from a survey of 1025 adult Americans. When asked if
In a survey conducted by CareerBuilder.com, employers were asked if they had ever fired an employee for shopping online while at work (“Cyber Monday Shopping at Work? You’re Not Alone,”
The article titled “13% of Americans Don’t Use the Internet. Who Are They?” describes a study conducted by the Pew Research Center (pewresearch.org, September 7, 2016, retrieved December 1,
The paper ?Breast MRI as an Adjunct to Mammography for Breast Cancer Screening in High- Risk Patients? (American Journal of Roentgenology [2015]: 889?897) describes a study that investigated the
Researchers at Boston’s Children’s Hospital and Harvard Medical School analyzed records of breast cancer screening and diagnostic evaluations (National Expenditure for False-Positive Mammograms
The article “Facebook Use and Academic Performance Among College Students,” Computers in Human Behavior [2015]: 265–272) estimated that 70 percent of students at a large public university in
A cruise ship charges passengers $3 for a can of soda. Because of passenger complaints, the ship manager has decided to try out a plan with a lower price. He thinks that with a lower price, more cans
A researcher speculates that because of differences in diet, Japanese children may have a lower mean blood cholesterol level than U.S. children do. Suppose that the mean level for U.S. children is
A national survey of 1012 adult Americans conducted by Gallup (“Americans Still Generally Upbeat About Personal Finances,” gallup.com, January 25, 2016, retrieved November 16, 2016) asked survey
CareerBuilder.com conducted a survey to learn about the proportion of employers who perform background checks when evaluating a job candidate (“Majority of Employers Background Check Employees . .
A press release about a paper that appeared in The Journal of Youth and Adolescence (springer.com /about+springer/media/springer+select?SGW ID=0-11001-6-1433942-0, August 26, 2013, retrieved May 8,
According to an article in Science Daily (“Still No Strong Evidence That Adjunct Treatment with HGH in IVF Improves Results,” sciencedaily.com, July 4, 2016, retrieved November 26, 2016), women
Explain why the statement x = 50 is not a legitimate hypothesis.
The report referenced in the previous exercise also indicated that 33% of those in a representative sample of 533 homeowners in southern states said that they had considered installing solar
The report “The Politics of Climate” (Pew Research Center, October 4, 2016, pewinternet .org/2016/10/04/the-politics-of-climate) summarized data from a survey on public opinion of renewable and
The report “The 2016 Consumer Financial Literacy Survey” (The National Foundation for Credit Counseling, nfcc.org, retrieved October 28, 2016) summarized data from a representative sample of 1668
The article referenced in the previous exercise also indicated that 811 of the 1001 students surveyed said that they would feel restricted if they could only work on digital devices. Would a 95%
The article “Write It by Hand to Make It Stick” (Advertising Age, July 27, 2016) summarizes data from a survey of 1001 students age 13 to 19. Of the students surveyed, 851 reported that they
Major League Baseball (MLB) includes two groups of teams, in ?leagues.? There are 15 teams in each of the American League (AL) and the National League (NL). Since 1997, teams in each of the leagues
The Economist collects data each year on the price of a Big Mac in various countries around the world. A sample of McDonald?s restaurants in Europe in 2016 resulted in the following Big Mac prices
Consumer Reports provides ratings for televisions, including energy cost per year (consumerreports .org/products/lcd-led-oled-tvs/ratings-overview/, retrieved December 23, 2016). Energy cost data for
Teams in the National Football League (NFL) are given a ?bye? during one week of the season, when they can rest and not play a game. This may provide an advantage for the team in the next game they
The authors of the paper ?Sex Differences in Time Perception During Smoking Abstinence? (Nicotine and Tobacco Research [2015]: 449?454) investigated how nicotine withdrawal affects time perception
Consumer Reports published the following gas mileage values (?Overall MPG?) for a sample of electric or plug-in hybrid car models (consumerreports
A 2016 study of 120 U.S. brand-name products found that 70% were active on Snapchat (businessinsider .com/what-exactly-are-brands-posting-on-snapchat -2016-6, June 15, 2016, retrieved May 4, 2017).
The report “One in Three American Households Are Stuck in a Relationship with a Financial Services Provider They Don’t Trust” (businesswire.com/news /home/20160629005198/en/American-Households
In mid-2016 the United Kingdom (UK) withdrew from the European Union (an event known as ?Brexit?), causing economic concerns throughout the world. One indicator that economists use to monitor the
A survey of a representative sample of 478 U.S. employers determined that 359 ranked stress as their top health and productivity concern (globenewswire .com/news release/2016/06/29/852338/0/en
During the 2016 NBA Finals, Kevin Love of the Cleveland Cavaliers successfully made 5 three-point shots out of 19 attempts. Assume that these attempts comprise a sample that is representative of his
An article titled “The Latest on Workplace Monitoring and Surveillance” (American Management Association, November 17, 2014) referred to the “2007 Electronic Monitoring & Surveillance
The article ?Report: More Than Half of DC-Area Millennials Are Using Ride-Hailing Apps? (washingtonian.com/2016/06/23/report-half-dc -area-millennials-using-ride hailing-apps/, June 23, 2016,
A survey on SodaHead (sodahead.com/survey /featured/anonymous-advice/?results=1, retrieved May 13, 2016) reported that 603 out of 753 respondents replied ?No? to the question ?Should You Be Friends

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