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Questions and Answers of Business Statistics

Egg production per year in Malaysia can be closely approximated as being normally distributed with a standard deviation of 83 million eggs. If during the year only 3% of egg farmers produce more than
Graph the distribution for problem 5.10. For which values of x are the probabilities highest? Determine the expected value of this distribution. How does the expected value compare with the values of
According to the ABS, 64% of Australian adults live in capital cities. Further, the ABS reports that about 3% of all Australian adults care for ill relatives. Suppose that, of those adults living in
A survey conducted by Roy Morgan Research asked 1116 Australians to nominate health issues they consider important. Sixty per cent of respondents nominated cancer as an important health issue, while
The chief financial officer (CFO) for the producer of a well-known fashion line has recently come under fire for suggesting that retailers should hire younger people as frontline employees to improve
According to an industry survey, women make more photo prints than men. Eighty per cent of users of photo-printing kiosks are women. Sixty-three per cent of women think photo prints are important,
Suppose that, for every family holiday trip of more than 2000 km by car, an average of 0.60 flat tyres occurs. Suppose also that the number of flat tyres per trip of more than 2000 km is Poisson
The average fee charged by suburban accountants to do a basic tax return in Brisbane was found to be normally distributed with a mean of $110 and standard deviation of $15. If a random sample of 45
These are data for job vacancies in the mining industry in Australia for the period November 2015 to May 2020. Use the data to answer the following questions.(a) Compute a 4-period MA to forecast job
In an experiment to investigate the effect of the portrayal of female characters in superhero movies, researchers randomly assigned female college students to one of three groups (?The Empowering
The paper ?Trends in Blood Lead Levels and Blood Lead Testing among U.S. Children Aged 1 to 5 Years? (Pediatrics [2009]: e376?e385) gave data on blood lead levels (in mg/dL) for samples of children
It is common for baseball pitchers to use stretching to prepare for a game. But does this make a difference? The authors of the paper ?The Acute Effects of Upper Extremity Stretching on Throwing
The authors of the paper ?Reading Subtitles and Taking Enotes While Learning Scientific Materials in a Multimedia Environment? (Educational Technology and Society [2016): 47?58) were interested in
Do people feel hungrier after sampling a healthy food? The authors of the paper ?When Healthy Food Makes You Hungry? (Journal of Consumer Research [2010]: S34 S44) carried out a study to answer this
This exercise requires the use of a statistical software package. Use the data given in Exercise 14.29 to verify that the regression function is estimated by (mean y value) %3Da+ Bx, + Bx, + Вх, +
The paper referenced in Exercise 14.16 used a multiple regression model to describe the relationship between y = Percentage of body fat mass and three predictor variables.x1 = log of body mass index
Because it is difficult to measure body fat, researchers have considered different ways to predict body fat based on other characteristics. One model proposed in the paper “A Comparison Between
Groundwater is the main source of water in many countries. In a study of the quality of ground water in Yemen, the authors of the paper “Multiple Linear Regression Model for Chloride Estimation of
The authors of the paper “Power-Load Prediction Based on Multiple Linear Regression Model” (Boletin Tecnico [2017]: 390–397) were interested in predicting the load on the electric power system
Investigators in northern Alaska periodically monitored radio-collared wolves in 25 wolf packs over 4 years, keeping track of the packs? home ranges (?Population Dynamics and Harvest Characteristics
The graphs accompanying this exercise are based on data from an experiment to assess the effects of logging on a squirrel population in British Columbia (?Effects of Logging Pattern and Intensity on
The paper referenced in Exercise 13.9 (?Depression, Body Mass Index, and Chronic Obstructive Pulmonary Disease?A Holistic Approach,? International Journal of COPD [2016]: 239?249) gave data on x =
Acrylamide is a chemical that is sometimes found in cooked starchy foods and which is thought to increase the risk of certain kinds of cancer. The paper ?A Statistical Regression Model for the
The accompanying data are a subset of data from the report “Great Jobs, Great Lives” (Gallup-PurdueIndex 2015 Report, gallup.com/reports/197144 /gallup-purdue index-report-2015.aspx,
The largest commercial fishing enterprise in the southeastern United States is the harvest of shrimp. In a study described in the paper ?Long-term Trawl Monitoring of White Shrimp, Litopenaeus
The paper ?Depression, Body Mass Index, and Chronic Obstructive Pulmonary Disease?A Holistic Approach? (International Journal of COPD [2016]: 239?249) gives data on x = Change in body mass index (BMI
The accompanying graphical display is similar to one that appeared in USA TODAY (February 19, 2010). It is meant to be a pie chart, but an oval rather than a circle is used to represent the whole
The authors of the paper ?Risk of Malnutrition Is an Independent Predictor of Mortality, Length of Hospital Stay, and Hospitalization Costs in Stroke Patients? (Journal of Stroke and Cerebrovascular
The report referenced in the previous exercise also provided data on perception of money management skills by age group. Use the data from 788 people, in the accompanying table to determine if there
Using data from a national survey, the authors of the paper “What Do Happy People Do?” (Social Indicators Research [2008]: 565–571) concluded that there was convincing evidence of an
The report ?Majoring in Money: How American College Students Manage Their Finances,? (June 28,2016, salliemae.newshq.businesswire.com/sites? /salliemae.newshq.businesswire.com/files/doc
The report ?Consumer Revolving Credit and Debt Over the Life Cycle and Business Cycle? describes a study conducted by the Federal Reserve Bank of Boston (bostonfed.org, October 2015, retrieved May
The report ?Education Pays 2016? (The CollegeBoard, trends.collegeboard.org/sites/default? /files/education-pays-2016-full-report.pdf, retrieved May 27, 2017) provided information on education level
Each person in a representative sample of 445 college students age 18 to 24 was classified according to age and to the response to the following question: “How often have you used a credit card to
The Knight Foundation investigated whether high school students agreed with the statement that people should be allowed to burn or deface the American flag as a political statement. This question was
The Knight Foundation asked each person in a representative sample of high school students and in a representative sample of high school teachers which of the rights guaranteed by the First Amendment
Some colleges now allow students to pay their tuition using a credit card. The report ?Credit Card Tuition Payment Survey 2014? (creditcards .com/credit-card news/tuition-charge-fee-survey .php,
The authors of the paper ?External Factors and the Incidence of Severe Trauma: Time, Date, Season and Moon? (Injury [2014]: S93?S99) classified admissions to hospitals in Germany according to season.
A popular urban legend is that more babies than usual are born during certain phases of the lunar cycle, especially near the full moon. The paper “The Effect of the Gravitation of the Moon on
The “Global Automotive 2016 Color Popularity Report” (Axalta Coating Systems, axaltacs.com) included data on the colors for a sample of new cars sold in North America. They reported that 25% of
In 2014, the University of Houston carried out a study for the Texas Lottery Commission (“Demographic Survey of Texas Lottery Players”) that gives the age distribution for a representative sample
The article “Americans Say No to Electric Cars Despite Gas Prices” (USA TODAY, May 25, 2011) describes a survey of public opinion on issues related to rising gas prices. The survey was conducted
As part of a study described in the report ?I Can?t Get My Work Done!? (harmon.ie/blog/i-cant-get -my-work-done-how-collaboration-social-toolsdrain- productivity, 2011, retrieved May 6, 2017), people
A report in USA TODAY described an experiment to explore the accuracy of wearable devices designed to measure heart rate (“Wearable Health Monitors Not Always Reliable, Study Shows,” USA TODAY,
Example 11.11 describes a study in which 354 of 708 people in the sample of 18- to 29-year-olds and 412 of the 1029 people in the sample of 30- to 49-year-olds said that they thought it was OK to use
An article titled ?TCU Horned Frogs Game Preview (Part 1)? (uwdawgpound.com/2016/11 /26/13710900/washington-huskies-tcu-horned -frogs-game-preview-part-1, retrieved December 20, 2016) previews a
Researchers were interested in comparing regularintensity exercise and high-intensity exercise for patients recovering from hospitalization due to chronic obstructive pulmonary disease (COPD). The
The report ?The 2016 Inside Higher Ed Survey of Faculty Attitudes on Technology? (insidehighered.com /booklet/2016-survey-faculty-attitudes-technology, retrieved December 14, 2016) describes the
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

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