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Questions and Answers of Statistics

What was the average price of a room at two-star, three-star, and four-star hotels in cities around the world in 2009? The file contains the prices in English pounds (about US $1.57 as of October
The file Protein contains calorie and cholesterol information concerning popular protein foods (fresh red meats, poultry, and fish).a. Construct a percentage histogram for the number of calories.b.
The file contains the monthly average price of gasoline in the United States from January 1, 2006, to March 1, 2010. Prices are in dollars per gallon.a. Construct a time-series plot.b. What pattern,
The following data (stored in Drink) represent the amount of soft drink in a sample of 50 consecutively filled 2-liter bottles. The results are listed horizontally in the order of being filled:a.
The S&P 500 Index tracks the overall movement of the stock market by considering the stock prices of 500 large corporations. The file Stock Prices contains weekly data for this index as well as
The following set of data is from a sample of n = 5:7 4 9 8 2a. Compute the mean, median, and mode.b. Compute the range, variance, standard deviation, and coefficient of variation.c. Compute the Z
The file FastFood contains the amount that a sample of nine customers spent for lunch ($) at a fast-food restaurant:a. Compute the mean and median.b. Compute the variance, standard deviation, range,
The file Sedans contains the overall miles per gallon (MPG) of 2010 family sedans:a. Compute the mean, median, and mode.b. Compute the variance, standard deviation, range, coefficient of variation,
The file SUV contains the overall miles per gallon (MPG) of 2010 small SUVs:a. Compute the mean, median, and mode.b. Compute the variance, standard deviation, range, coefficient of variation, and Z
The file ChocolateChip contains the cost (in cents) per 1-ounce serving for a sample of 13 chocolate chip cookies. The data are as follows:a. Compute the mean, median, and mode.b. Compute the
The file DarkChocolate contains the cost per ounce ($) for a sample of 14 dark chocolate bars:a. Compute the mean, median, and mode.b. Compute the variance, standard deviation, range, coefficient of
Is there a difference in the variation of the yields of different types of investments? The file SavingRate-MMCD contains the yields for a money market account and a five-year certificate of deposit
The file HoteIUK contains the room price (in $) paid by U.S. travelers in six British cities in 2009:185 160 126 116 112 105a. Compute the mean, median, and mode.b. Compute the range, variance, and
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
Suppose that another bank branch, located in a residential area, is also concerned with the noon-to-1 P.M. lunch hour. The waiting time, in minutes, collected from a sample of 15 customers during
General Electric (GE) is one of the world's largest companies; it develops, manufactures, and markets a wide range of products, including medical diagnostic imaging devices, jet engines, lighting
The following set of data is from a sample of n = 6:7 4 9 7 3 12a. Compute the mean, median, and mode.b. Compute the range, variance, standard deviation, and coefficient of variation.c. Compute the Z
TASER International, Inc., develops, manufactures, and sells nonlethal self-defense devices known as tasers. Marketing primarily to law enforcement, corrections institutions, and the military,
In 2009, all the major stock market indices increased dramatically as they recovered from the world financial crisis that occurred in 2008. The data in the following table (stored in Indices)
In 2006-2009, the value of precious metals changed rapidly. The data in the following table (contained in the file) represent the total rate of return (in percentage) for platinum, gold, and silver
The following is a set of data from a sample of n = 7: 12 7 4 9 0 7 3 a. Compute the first quartile (Q1), the third quartile (Q3), and the interquartile range. b. List the five-number summary. c.
The following is a set of data from a sample of n = 6: 7 4 9 7 3 12 a. Compute the first quartile (Q1), the third quartile (Q3), and the interquartile range. b. List the five-number summary. c.
The following is a set of data from a sample of n = 5: 7 4 9 8 2 a. Compute the first quartile (Q1), the third quartile (Q3) and the interquartile range. b. List the five-number summary. c. Construct
The following is a set of data from a sample of n = 5: a. Compute the first quartile (Q1), the third quartile (Q3) and the interquartile range. b. List the five-number summary. c. Construct a boxplot
The file ChocolateChip contains the cost (in cents) per 1-ounce serving, for a sample of 13 chocolate chip cookies. The data are as follows:a. Compute the first quartile (Q1) the third quartile (Q3)
The file Dark Chocolate contains the cost ($) per ounce for a sample of 14 dark chocolate bars:a. Compute the first quartile (Q1), the third quartile (Q3), and the interquartile range.b. List the
The file HateIUK contains the room price (in $) paid by U.S. travelers in six British cities in 2009: 185 160 126 116 112 105 a. Compute the first quartile (Q1) the third quartile (Q3) and the
The following set of data is from a sample of n = 7:12 7 4 9 0 7 31. Compute the mean, median, and mode.2. Compute the range, variance, standard deviation, and coefficient of variation.3. Calculate
The file SUV contains the overall miles per gallon (MPG) of 2010 small SUVs:a. Compute the first quartile (Q1), the third quartile (Q3), and the interquartile range.b. List the five-number summary.c.
The file SavingRate-MMCD contains the yields for a money market account and a five-year certificate of deposit (CD), for 25 banks in the United States, as of March 29, 2010.For each type of
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
a. Construct a multidimensional table of the mean 2008 return by type and risk.b. Construct a multidimensional table of the standard deviation of the 2008 return by type and risk.c. What conclusions
a. Construct a multidimensional table of the mean three-year return by type and risk. b. Construct a multidimensional table of the standard deviation of the three-year return by type and risk. c.
a. Construct a multidimensional table of the mean five-year return by type and risk. b. Construct a multidimensional table of the standard deviation of the five-year return by type and risk. c. What
a. Construct a multidimensional table of the mean 2008 return by type, fees, and risk. b. Construct a multidimensional table of the standard deviation of the 2008 return by type, fees, and risk. c.
The file contains the quarterly sales tax receipts (in thousands of dollars) submitted to the comptroller of the Village of Fair Lake for the period ending March 2010 by all 50 business
The following set of data is from a sample of n = 5:7 -5 -8 7 9a. Compute the mean, median, and mode.b. Compute the range, variance, standard deviation, and coefficient of variation.c. Compute the Z
Consider a population of 1,024 mutual funds that primarily invest in large companies. You have determined that μ the mean one-year total percentage return achieved by all the funds, is 8.20 and
The file CigaretteTax contains the state cigarette tax ($) for each of the 50 states as of December 31, 2009.a. Compute the population mean and population standard deviation for the state cigarette
The file 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
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
The following is a set of data from a sample of n = 11 items:a. Compute the covariance.b. Compute the coefficient of correlation.c. How strong is the relationship between X and Y? Explain.
A study of 218 students at Ohio State University suggests a link between time spent on the social networking site Facebook and grade point average. Students who rarely or never used Facebook had
The file 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
Movie companies need to predict the gross receipts of individual movies after a movie has debuted. The following results, listed in PotterMovies, are the first weekend gross, the U.S. gross, and the
College basketball is big business, with coaches' salaries, revenues, and expenses in millions of dollars. The file College Basketball contains the coaches' salaries and revenues for college
College football players trying out for the NFL are given the Wonderlic standardized intelligence test. The file contains Wonderlic the averageWonderlic score of football players trying out for the
What are the differences among the mean, median, and mode, and what are the advantages and disadvantages of each? Discuss.
How do you interpret the first quartile, median, and third quartile? Discuss.
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
How do the empirical rule and the Chebyshev rule differ? Discuss.
How do the covariance and the coefficient of correlation differ? Discuss.
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
In NewYork State, savings banks are permitted to sell a form of life insurance called savings bank life insurance (SBLI). The approval process consists of underwriting, which includes a review of the
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
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
The manufacturing company in Problem 3.64 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,
The file VeggieBurgur contains data on the calories and total fat (in grams per serving) for a sample of 12 veggie burgers.a. For each variable, compute the mean, median, first quartile, and third
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
The manufacturer of Boston and Vermont asphalt shingles provides its customers with a 20-year warranty on most of its products. To determine whether a shingle will last as long as the warranty
The file contains the cost per meal and the ratings of 50 city and 50 suburban restaurants on their food, décor, and service (and their summated ratings). Complete the following for the urban and
A survey conducted by the American Statistical Association reported the results at the top of page 111 for the salaries of professors teaching statistics in research universities with four to five
The file contains calories, protein, and cholesterol of popular protein foods (fresh red meats, poultry, and fish).1. Compute the correlation coefficient between calories and protein.2. Compute the
The file contains the average price of a room at two-star, three-star, and four-star hotels in cities around the world in 2009 in English pounds (about US$1.57 as of October 2010). Complete the
The file 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
The file CEO-Compensation includes the total compensation (in millions of $) of CEOs of 197 large public companies and the investment return in 2009. Complete the following for the total compensation
The file contains the percentage of alcohol, number of calories per 12 ounces, and number of carbohydrates (in grams) per 12 ounces for 139 of the best-selling domestic beers in the United
Complete the following for expense ratio in percentage, three-year return, and five-year return.a. Compute the mean, median, first quartile, and third quartile.b. Compute the range, interquartile
You want to compare bond funds that have fees to those that do not have fees. For each of these two groups, use the variables expense ratio, return 2009, three-year return, and five-year return and
You want to compare intermediate government to the short-term corporate bond funds. For each of these two groups, use the variables expense ratio, three-year return, and five-year return and complete
You want to compare bond funds based on risk. For each of these three levels of risk (below average, average, above average), use the variables expense ratio, return 2009, three-year return, and
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
Problem 1.27 on page 14 describes a survey of 62 undergraduate students (stored in UndergradSurvey). For these data, for each numerical variable, complete the following.a. Compute the mean, median,
Problem 1.28 on page 15 describes a survey of 44 MBA students (stored in GradSurvey). For these data, for each numerical variable, complete the following.a. Compute the mean, median, first quartile,
According to the U.S. Census Bureau, in February 2010, the median sales price of new houses was $220,500 and the mean sales price was $282,600 (extracted from www.census.gov, March 24, 2010). a.
Two 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?
Do people of different age groups differ in their response to email messages? A survey by the Center for the Digital Future of the University of Southern California (data extracted from A. Mindlin,
Referring to the contingency table in Problem 4.10, if a respondent is selected at random, what is the probability thata. he or she answers quickly?b. he or she is over 70 years old?c. he or she
According to a Gallup Poll, the extent to which employees are engaged with their workplace varies from country to country. Gallup reports that the percentage of U.S. workers engaged with their
What is the preferred way for people to order fast food? A survey was conducted in 2009, but the sample sizes were not reported. Suppose the results, based on a sample of 100 males and 100 females,
A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior. Among the questions asked was "Do you enjoy shopping for clothing?" Of 240 males, 136 answered yes.
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 warranty-related
Consider the following contingency table:What is the probability of a. A|B? b. A|B'? c. A'|B'? d. Are events A and B independent?
Consider the following contingency table:What is the probability of a. A|B? b. A'|B'? c. A|B'? d. Are events A and B independent?
Does it take more time to be removed from an email list than it used to take? A study of 100 large online retailers revealed the following:a. Given that three or more clicks are needed to be removed
Do people of different age groups differ in their response to email messages? A survey by the Center for the Digital Future of the University of Southern California (data extracted from A. Mindlin,
What is the preferred way for people to order fast food? A survey was conducted in 2009, but the sample sizes were not reported. Suppose the results, based on a sample of 100 males and 100 females,
According to a Gallup Poll, the extent to which employees are engaged with their workplace varies from country to country. Gallup reports that the percentage of U.S. workers engaged with their
A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior, with the following results:a. Suppose that the respondent chosen is a female. What is the probability
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 warranty-related
In 38 of the 60 years from 1950 through 2009, the S&P 500 finished higher after the first five days of trading. In 33 of those 38 years, the S&P 500 finished higher for the year. Is a good first week
A standard deck of cards is being used to play a game. There are four suits (hearts, diamonds, clubs, and spades), each having 13 faces (ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, jack, queen, and king),
A box of nine gloves contains two left-handed gloves and seven right-handed gloves.1. If two gloves are randomly selected from the box, without replacement (the first glove is not returned to the box
Consider the following contingency table:What is the probability ofa. event A?b. event A'?c. event A and B?d. A or B?
If P(B) = 0.05, P(A | B) = 0.80, P(B') = 0.95, and P(A |B') = 0.40, find P(B | A).
If P(B) = 0.30, P(A | B) = 0.60, P(B') = 0.70, and P(A |B') = 0.50, find P(B | A).
In Example 4.10 on page 164, suppose that the probability that a medical diagnostic test will give a positive result if the disease is not present is reduced from 0.02 to 0.01.a. If the medical
An advertising executive is studying television viewing habits of married men and women during prime-time hours. Based on past viewing records, the executive has determined that during prime time,
Olive Construction Company is determining whether it should submit a bid for a new shopping center. In the past, Olive's main competitor, Base Construction Company, has submitted bids 70% of the
Laid-off workers who become entrepreneurs because they cannot find meaningful employment with another company are known as entrepreneurs by necessity. The Wall Street Journal reports that these

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