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Business Statistics A First Course 7th Global Edition Kathryn A. Szabat, David M. Levine, David F. Stephan - Solutions
Do people of different age groups differ in their response to email messages? A survey reported that 78.1% of users over 70 years of age believe that email messages should be answered quickly, as compared to 50.6% of users between 13 and 50 years old. Suppose that the survey was based on 1,000
Do males or females feel more tense or stressed out at work? A survey of employed adults conducted online by Harris Interactive on behalf of the American Psychological Association revealed the following:
If P1A2 = 0.3, P1B2 = 0.7, and P1A and B2 = 0.21, are A and B independent?
If P1A2 = 0.7, P1B2 = 0.6, and A and B are independent, find P(A and B).
If P1A and B2 = 0.4 and P1B2 = 0.8, find P1A B2
Consider the following contingency table:What is the probability ofa. A B?b. A′ B′?c. A B′?d. Are events A and B independent?
Use the contingency table below to find the following probabilitiesa. A B?b. A B′?c. A′ B′?d. Are events A and B independent?
Each year, ratings are compiled concerning the performance of new cars during the first 90 days of use. Suppose that the cars have been categorized according to whether a car needs warrantyrelated repair (yes or no) and the country in which the company manufacturing a car is based (United States or
A survey of 1,085 adults asked, “Do you enjoy shopping for clothing for yourself?” The results (data extracted from “Split Decision on Clothes Shopping,” USA Today, January 28, 2011, p. 1B) indicated that 51% of the females enjoyed shopping for clothing for themselves as compared to 44% of
In your country, what is the preferred way for people to order fast food? A survey was conducted in 2014, but the sample sizes were not reported. Suppose the results, based on a sample of 200 males and 200 females, were as follows If a respondent is selected at random, what is the probability
What business and technical skills are critical for today’s business intelligence/analytics and information management professionals? As part of InformationWeek’s 2013 U.S. IT Salary Survey, business intelligence/analytics and information management professionals, both staff and managers, were
Referring to the contingency table in Problem 4.10, if a marketer is selected at random, what is the probability thata. he or she plans to increase use of LinkedIn?b. he or she is a B2C marketer?c. he or she plans to increase use of LinkedIn or is a B2C marketer?d. Explain the difference in the
How will marketers change their social media use in the near future? A survey by Social Media Examiner reported that 78% of B2B marketers (marketers that focus primarily on attracting businesses) plan to increase their use of LinkedIn, as compared to 54%of B2C marketers (marketers that primarily
Referring to the contingency table in Problem 4.8, if an employed adult is selected at random, what is the probability thata. the employed adult felt tense or stressed out at work?b. the employed adult was a male who felt tense or stressed out at work?c. the employed adult was a male or felt tense
Do males or females feel more tense or stressed out at work?A survey of employed adults conducted online by Harris Interactive
Which of the following events occur with a probability of zero? For each, state why or why not.a. A company is listed on the New York Stock Exchange and NASDAQ.b. A consumer owns a smartphone and a tablet.c. A cellphone is a Motorola and a Samsung.d. An automobile is a Toyota and was manufactured
For each of the following, state whether the events created are mutually exclusive and whether they are collectively exhaustive.a. Undergraduate business students were asked whether they were sophomores or juniors.b. Each respondent was classified by the type of car he or she drives: sedan, SUV,
For each of the following, indicate whether the type of probability involved is an example of a priori probability, empirical probability, or subjective probability.a. There will be at least 16 tropical storms this summer.b. A certain model will win the beauty contest.c. The next roll of a fair die
Consider the following contingency table:What is the probability of eventa. A′?b. A and B?c. A′ and B′?d. A′ or B′?
Consider the following contingency table:B B′A 10 20 A′ 20 40 What is the probability of eventa. A?b. A′?c. A and B?d. A or B?
An urn contains 12 red balls and 8 white balls. One ball is to be selected from the urn.a. Give an example of a simple event.b. What is the complement of a red ball?c. What does the sample space consist of?
Five coins are tossed.a. Give an example of a simple event.b. Give an example of a joint event.c. What is the complement of a head on the first toss?d. What does the sample space consist of?
Summarize your findings in a report that can be included with the task force’s study.
For the variable you identify, construct a graphical display. What conclusions can you reach from this other plot that cannot be made from the boxplot?
For the variable you identify, compute the appropriate numerical descriptive measures and construct a boxplot.
The file Domesticbeer contains the percentage alcohol, number of calories per 12 ounces, and number of carbohydrates (in grams) per 12 ounces for 156 of the best-selling domestic beers in the United States. (Data extracted from bit.ly/17H3Ct, March 12, 2014.) Write a report that includes a complete
You are planning to study for your statistics examination with a group of classmates, one of whom you particularly want to impress. This individual has volunteered to use Microsoft excel to generate the needed summary information, tables, and charts for a data set that contains several numerical
how do the average credit scores of people living in various American cities differ? The file Credit Scores is an ordered array of the average credit scores of people living in 143 American cities. (Data extracted from usat.ly/17a1fA6)a. Compute the mean, median, first quartile, and third
how much time do Americans living in or near cities spend waiting in traffic, and how much does waiting in traffic cost them per year? The file Congestion includes this cost for 31 cities. (Source:Data extracted from “The high Cost of Congestion,” Time, October 17, 2011, p. 18.) For the time
311 is Chicago’s web and phone portal for government information and nonemergency services. 311 serves as a comprehensive one-stop shop for residents, visitors, and business owners;therefore, it is critical that 311 representatives answer calls and respond to requests in a timely and accurate
have you wondered how Internet download speed varies around the globe? The file DownloadSpeed contains the mean download speed Mbps for various countries. (Data extracted from www.netindex.com/download/allcountries/.)a. Compute the mean, median, first quartile, and third quartile.b. Compute the
The file propertyTaxes contains the property taxes per capita for the 50 states and the District of Columbia.a. Compute the mean, median, first quartile, and third quartile.b. Compute the range, interquartile range, variance, standard deviation, and coefficient of variation.c. Construct a boxplot.
The file hotelprices contains the prices in British pounds(about US$1.52 as of July 2013) of a room at two-star, threestar, and four-star hotels in cities around the world in 2013.(Data extracted from press.hotels.com/content/blogs.dir/13/files/2013/09/HPI_UK.pdf.) Complete the following for
A quality characteristic of interest for a tea-bag-filling process is the weight of the tea in the individual bags. If the bags are underfilled, two problems arise. First, customers may not be able to brew the tea to be as strong as they wish. Second, the company may be in violation of the
Data were collected on the typical cost of dining at Americancuisine restaurants within a 1-mile walking distance of a hotel located in a large city. The file bundle contains the typical cost(a per transaction cost in $) as well as a Bundle score, a measure of overall popularity and customer
The manufacturing company in problem 3.60 also produces electric insulators. If the insulators break when in use, a short circuit is likely to occur. To test the strength of the insulators, destructive testing is carried out to determine how much force is required to break the insulators. Force is
inches. Data are collected from a sample of 49 troughs and stored in Trough , which contains these widths of the troughs, in inches:
inches and
A manufacturing company produces steel housings for electrical equipment. The main component part of the housing is a steel trough that is made of a 14-gauge steel coil. It is produced using a 250-ton progressive punch press with a wipe-down operation and two 90-degree forms placed in the flat
One of the major measures of the quality of service provided by an organization is the speed with which it responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a major expansion in the past several years. In
In certain states, savings banks are permitted to sell life insurance. The approval process consists of underwriting, which includes a review of the application, a medical information bureau check, possible requests for additional medical information and medical exams, and a policy compilation
The American Society for Quality (ASQ) conducted a salary survey of all its members. ASQ members work in all areas of manufacturing and service-related institutions, with a common theme of an interest in quality. Manager and quality engineer were the most frequently reported job titles among the
how do the boxplots for the variously shaped distributions differ?
how do the covariance and the coefficient of correlation differ?
What is the difference between Lepokurtic and platykurtic?
What is meant by the property of shape?
What does the Chebyshev rule indicate? What type of distribution is it applied to?
how does the empirical rule help explain the ways in which the values in a set of numerical data cluster and distribute?
What are the differences among the various measures of variation, such as the range, interquartile range, variance, standard deviation, and coefficient of variation, and what are the advantages and disadvantages of each?
What does the Z score measure?
What is meant by the property of variation?
how do you interpret the first quartile, median, and third quartile?
What are the differences among the mean, median, and mode, and what are the advantages and disadvantages of each?
What is meant by the property of central tendency?
What are the properties of a set of numerical data?
A pew research Center survey found that social networking is popular in many nations around the world. The file globalSocialMedia contains the level of social media networking (measured as the percentage of individuals polled who use social networking sites) and the GDp at purchasing power
College football is big business, with coaches’ total pay and revenues, in millions of dollars. The file College Football contains the coaches’ pay and revenues for college football at 105 of the 124 schools that are part of the Division I Football Bowl Subdivision.Source: Data extracted from
Movie companies need to predict the gross receipts of individual movies once a movie has debuted. The data, shown in the next column and stored in potterMovies , are the first weekend gross, the U.S. gross, and the worldwide gross (in $ millions) of the eight harry potter movies:a. Compute the
The file Cereals lists the calories and sugar, in grams, in one serving of seven breakfast cereals:a. Compute the covariance.b. Compute the coefficient of correlation.c. Which do you think is more valuable in expressing the relationship between calories and sugar—the covariance or the coefficient
A study of 483 first-year college women suggests a link between media usage such as texting, chatting on cell phones, and posting status updates on Facebook, and grade point average. Students reporting a higher use of media had lower grade point averages than students reporting a lower use of
The following is a set of data from a sample of n = 11 items:X 7 5 8 3 6 10 12 4 9 15 18 Y 21 15 24 9 18 30 36 12 27 45 54a. Compute the covariance.b. Compute the coefficient of correlation.c. how strong is the relationship between X and Y? explain.
Thirty companies comprise the DJIA. Just how big are these companies? One common method for measuring the size of a company is to use its market capitalization, which is computed by multiplying the number of stock shares by the price of a share of stock. On March 14, 2014, the market capitalization
The file Energy contains the per capita energy consumption, in kilowatt-hours, for each of the 50 states and the District of Columbia during a recent year.a. Compute the mean, variance, and standard deviation for the population.b. What proportion of these states has per capita energy consumption
The file CigaretteTax contains the state cigarette tax (in $)for each of the 50 states as of January 1, 2014.a. Compute the population mean and population standard deviation for the state cigarette tax.b. Interpret the parameters in (a)
Consider a population of 1,024 mutual funds that primarily invest in large companies. You have determined that m, the mean one-year total percentage return achieved by all the funds, is 8.20 and that s, the standard deviation, is 2.75.a. According to the empirical rule, what percentage of these
The file RadioShack contains the number of radioShack stores located in each of the 50 U.S. states and the District of Columbia, as of December 31, 2013:65 20 76 53 565 82 68 18 12 309 127 24 28 197 122 68 56 75 81 33 99 115 155 81 47 97 28 33 40 36 156 41 342 139 9 203 59 70 232 20 69 22 88 408 41
The following is a set of data for a population with N = 10:7 5 6 6 6 4 8 6 9 3a. Compute the population mean.b. Compute the population standard deviation.
The following is a set of data for a population with N = 10:9 8 11 15 14 11 3 7 9 7a. Compute the population mean.b. Compute the population standard deviation.
A bank branch located in a commercial district of a city has the business objective of developing an improved process for serving customers during the noon-to-1:00 p.m. lunch period.The waiting time, in minutes, is defined as the time the customer enters the line to when he or she reaches the
The file CD Rate contains the yields for one-year CDs and five-year CDs, for 22 banks in the United States, as of March 12, 2014.Source: Data extracted from www.Bankrate.com, March 12, 2014.For each type of account:a. Compute the first quartile 1Q12, the third quartile 1Q32, and the interquartile
The file SuV contains the overall MpG of 2014 small SUVs:26 22 23 21 25 24 22 26 25 22 21 21 22 22 23 24 23 22 21 22 Source: Data extracted from “Which Car Is right for You,” Consumer Reports, April 2014, pp. 60–61.a. Compute the first quartile 1Q12, the third quartile 1Q32, and the
The file hotelaway contains the average room price (in US$) paid by various nationalities while traveling abroad (away from their home country) in 2013:179 173 175 173 164 143 153 155 Source: Data extracted from http://bit.ly/1pdFkOG.a. Compute the first quartile 1Q12, the third quartile 1Q32, and
The file Marketpenetration contains Facebook penetration values (the percentage of the country population that are Facebook users) for 22 of the world’s largest economies:56 57 43 55 42 35 7 25 42 17 43 6 31 28 59 20 27 36 45 80 57 56 Source: Data extracted from slidesha.re/ODv6vG.a. Compute the
The data set below shows the overall miles per gallon(MpG) of a new model of small SUVs.21 25 24 25 21 23 22 21 22 21 23 24 27 17 19 22 26 17 21 18 23 24 24 15 17a. Compute the first quartile 1Q12, the third quartile 1Q32, and the interquartile range.b. List the five-number summary.c. Construct a
The following is a set of data from a sample of n = 5:7 4 9 8 2a. Compute the first quartile 1Q12, the third quartile 1Q32, and the interquartile range.b. List the five-number summary.c. Construct a boxplot and describe its shape.d. Compare your answer in (c) with that from problem 3.1 (d) on page
The following is a set of data from a sample of n = 6:7 4 9 7 3 12a. Compute the first quartile 1Q12, the third quartile 1Q32, and the interquartile range.b. List the five-number summary.c. Construct a boxplot and describe its shape.d. Compare your answer in (c) with that from problem 3.2 (d) on
The data below describe the fat content, in grams per serving, for a sample of 20 chicken sandwiches from fast-food chains.6 10 4 9 19 22 22 20 20 27 21 31 27 17 28 28 29 31 38 58a. Compute the first quartile 1Q12, the third quartile 1Q32, and the interquartile range.b. List the five-number
Using the one-year return percentage variable in Retirement Funds :a. Construct a table that computes the mean for each combination of type, risk, and rating.b. Construct a table that computes the standard deviation for each combination of type, risk, and rating.c. What conclusions can you reach
Using the one-year return percentage variable in Retirement Funds :a. Construct a table that computes the mean for each combination of market cap, risk, and rating.b. Construct a table that computes the standard deviation for each combination of market cap, risk, and rating.c. What conclusions can
Using the one-year return percentage variable in Retirement Funds :a. Construct a table that computes the mean for each combination of type, market cap, and rating.b. Construct a table that computes the standard deviation for each combination of type, market cap, and rating.c. What conclusions can
Using the one-year return percentage variable in Retirement Funds :a. Construct a table that computes the mean for each combination of type, market cap, and risk.b. Construct a table that computes the standard deviation for each combination of type, market cap, and risk.c. What conclusions can you
Suppose that another bank branch, located in a residential area, is also concerned with the noon-to-1:00 p.m. lunch hour. The waiting time, in minutes, collected from a sample of 15 customers during this hour, are stored in bank2 :9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 5.64 4.08 6.17
A bank branch located in a commercial district of a city has the business objective of developing an improved process for serving customers during the noon-to-1:00 p.m. lunch period.The waiting time, in minutes, is defined as the time the customer enters the line to when he or she reaches the
The file hotelaway contains the average room price (in US$) paid by various nationalities while traveling abroad (away from their home country) in 2013:179 173 175 173 164 143 153 155 Source: Data extracted from http://bit.ly/1pdFkOG.a. Compute the mean, median, and mode.b. Compute the range,
Is there a difference in the variation of the yields of different types of investments? The file CD Rate contains the yields for one-year certificates of deposit (CDs) and five-year CDs for 22 banks in the United States, as of March 12, 2014.Source: Data extracted from www.Bankrate.com, March 12,
The file Marketpenetration contains Facebook penetration values (the percentage of the country population who are Facebook users) for 22 of the world’s largest economies:56 57 43 55 42 35 7 25 42 17 43 6 31 28 59 20 27 36 45 80 57 56 Source: Data extracted from slidesha.re/ODv6vG.a. Compute the
The file accountingpartners contains the number of partners in a cohort of rising accounting firms that have been tagged as“firms to watch.” The firms have the following numbers of partners:17 23 19 23 18 17 23 16 34 10 14 30 14 33 26 17 19 22 20 27 33 25 12 26 13 30 13 13 33 21 17 12 10 14 12
The file SuV contains the overall miles per gallon (MpG)of 2014 small SUVs:26 22 23 21 25 24 22 26 25 22 21 21 22 22 23 24 23 22 21 22 Source: Data extracted from “Which Car Is right for You,” Consumer Reports, April 2014, pp. 60–61.a. Compute the mean, median, and mode.b. Compute the
The file Sedans contains the overall miles per gallon (MpG)of 2014 midsized sedans:38 26 30 26 25 27 24 22 27 32 39 26 24 24 23 24 25 31 26 37 22 33 Source: Data extracted from “Which Car Is right for You,” Consumer Reports, April 2014, pp. 40–41.
The file Mobileloyalty contains spending on products ($) during a three-month period by a sample of 15 customers receiving incentives through a mobile loyalty program.
According to the U.S. Census Bureau (census.gov), in 2013, the median sales price of new houses was $265,900 and the mean sales price was $322,100.a. Interpret the median sales price.b. Interpret the mean sales price.c. Discuss the shape of the distribution of the price of new houses.
The operations manager of a plant that manufactures tires wants to compare the actual inner diameters of two grades of tires, each of which is expected to be 575 millimeters. A sample of five tires of each grade was selected, and the results representing the inner diameters of the tires, ranked
The results of a survey report on the salaries of professors teaching statistics in research universities with four or five years in the rank of associate professor and professor are shown in the following table.
The following set of data is from a sample of n = 5:9 -5 -8 9 10a. Compute the mean, median, and mode.b. Compute the range, variance, standard deviation, and coefficient of variation.c. Compute the Z scores. Are there any outliers?d. Describe the shape of the data set.
The following set of data is from a sample of n = 7:12 7 4 9 0 7 3a. Compute the mean, median, and mode.b. Compute the range, variance, standard deviation, and coefficient of variation.c. Compute the Z scores. Are there any outliers?d. Describe the shape of the data set.
The following set of data is from a sample of n = 5:3 1 2 7 10a. Compute the mean, median, and mode.b. Compute the range, variance, standard deviation, and coefficient of variation.c. Compute the Z scores. Are there any outliers?d. Describe the shape of the data set.The following set of data is
Write a report to be presented to the management of CardioGood Fitness detailing your findings.
Create a customer profile for each CardioGood Fitness treadmill product line by developing appropriate tables and charts.
EndRun is proud that all Big Eight funds have gained in value over the past five years. Do you agree that EndRun should be proud of its selections? Why or why not?
Review the discussion about EndRun’s “Big Eight Difference” and then open and examine the attached sample of mutual funds. Are there any other relevant data from that file that could have been included in the Big Eight table?how would the new data alter your perception of EndRun’s claims?
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