Essential Statistics Exploring The World Through Data 2nd Global Edition Robert Gould, Colleen N. Ryan, Rebecca Wong - Solutions

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The following data represent the responses to two questions asked in a survey of 40 college students majoring in business:What is your gender? (M = male; F = female), and what is your major? (A = Accounting; C = Computer Information Systems;M = Marketing):Gender: M M M F M F F M F M Major: A C C M
The Consumer Financial Protection Bureau reports on consumer financial product and service complaint submissions by state, category, and company. The following table, stored in FinancialComplaints1 , represents complaints received from Louisiana consumers by complaint category for 2016.Category
The following table, stored in Smartphone Sales , represents the annual market share (percentage) of smartphones, by type, for the years 2011 through 2016.Type 2011 2012 2013 2014 2015 2016 Android 49.2% 69.0% 78.8% 81.5% 80.7% 80.7%iOS 18.8% 18.7% 15.1% 14.8% 17.7% 17.7%Microsoft 1.8% 2.5% 3.3%
The following data represent the responses to two questions asked in a survey of 40 college students majoring in business:What is your gender? (M = male; F = female), and what is your major? (A = Accounting; C = Computer Information Systems;M = Marketing):Gender: M M M F M F F M F M Major: A C C M
A categorical variable has three categories, with the following frequencies of occurrence:Category Frequency A 13 B 28 C 9a. Compute the percentage of values in each category.b. What conclusions can you reach concerning the categories?
Social media provides an enormous amount of data about the activities and habits of people using social platforms like Facebook and Twitter. The belief is that mining that data provides a treasure trove for those who seek to quantify and predict future human behavior. A marketer is planning a
Three professors examined awareness of four widely disseminated retirement rules among employees at the University of Utah. These rules provide simple answers to questions about retirement planning (R. N. Mayer, C. D. Zick, and M. Glaittle, “Public Awareness of Retirement Planning Rules of
Download and examine Zarca Interactive’s “Sample Survey for Associations/Sample Questions for Surveys for Associations,”available at bit.ly/2p5HlGO.a. Give an example of a categorical variable included in the survey.b. Give an example of a numerical variable included in the survey.
The American Community Survey (www.census.gov/acs)provides data every year about communities in the United States.Addresses are randomly selected and respondents are required to supply answers to a series of questions.a. Describe a variable for which data are collected.b. Is the variable
A recent PwC survey of 1,379 CEOs from a wide range of industries representing a mix of company sizes from Asia, Europe, and the Americas indicated that CEOs are firmly convinced that it is harder to gain and retain people’s trust in an increasingly digitalized world (pwc.to/2jFLzjF). Fifty-eight
The Gallup organization releases the results of recent polls on its website, www.gallup.com. Visit this site and read an article of interest.a. Describe the population of interest.b. Describe the sample that was collected.c. Describe a parameter of interest.d. Describe the statistic used to
Results of a 2017 Computer Services, Inc. (CSI) survey of a sample of 163 bank executives reveal insights on banking priorities among financial institutions (goo.gl/mniYMM). As financial institutions begin planning for a new year, of utmost importance is boosting profitability and identifying
Visit the official website for Microsoft Excel (products.office.com/excel), Minitab (www.minitab.com), or JMP (www.jmp.com). Review the features of the program you chose and then state the ways the program could be useful in statistical analysis.
What is the difference between sampling error and measurement error?
What is the difference between coverage error and nonresponse error?
What is the difference between unstacked and stacked variables?
What is the difference between a missing value and an outlier?
State the advantage of each of the probability sampling methods.
What is the difference between an interval scaled variable and a ratio scaled variable?
State an example for each of the nominal and ordinal scaled variables that might be represented in the same numerical form.
What is the difference between a discrete numerical variable and a continuous numerical variable?
What is the difference between a categorical variable and a numerical variable?
What is the difference between a statistic and a parameter?
What is the difference between sampling error and measurement error?1.35 What is the difference between a sample and a population?
What is the difference between coverage error and nonresponse error?
What is the difference between unstacked and stacked variables?
What is the difference between a missing value and an outlier?
State the advantage of each of the probability sampling methods.
What is the difference between an interval scaled variable and a ratio scaled variable?
State an example for each of the nominal and ordinal scaled variables that might be represented in the same numerical form.
What is the difference between a discrete numerical variable and a continuous numerical variable?
What is the difference between a categorical variable and a numerical variable?
What is the difference between a statistic and a parameter?
What is the difference between a sample and a population?
A recent PwC survey of 1,379 CEOs from a wide range of industries representing a mix of company sizes from Asia, Europe, and the Americas indicated that CEOs are firmly convinced that it is harder to gain and retain people’s trust in an increasingly digitalized world (pwc.to/2jFLzjF). Fifty-eight
The librarian at a university library in Norway conducts a survey to measure the students satisfaction regarding the library’s services. Across a period of 3 weeks, he interviews every 50th student who enters the library. He explains the various services the library offers before recording the
A survey was conducted to determine the overall satisfaction of a school’s café. The school has 750 students who attend morning and afternoon classes. In order to conduct the survey, the school only asked the 350 students who attend the morning classes to complete the evaluation. Give one
A recent PwC survey of 1,379 CEOs from a wide range of industries representing a mix of company sizes from Asia, Europe, and the Americas indicated that CEOs are firmly convinced that it is harder to gain and retain people’s trust in an increasingly digitalized world (pwc.to/2jFLzjF). Fifty-eight
The librarian at a university library in Norway conducts a survey to measure the students satisfaction regarding the library’s services. Across a period of 3 weeks, he interviews every 50th student who enters the library. He explains the various services the library offers before recording the
A survey was conducted to determine the overall satisfaction of a school’s café. The school has 750 students who attend morning and afternoon classes. In order to conduct the survey, the school only asked the 350 students who attend the morning classes to complete the evaluation. Give one
A survey indicates that the vast majority of college students own their own smartphones. What information would you want to know before you accepted the results of this survey?
A hotel management company runs 10 hotels in a resort area. The hotels have a mix of pricing—some hotels have budget rooms, some have moderately priced rooms, and some have deluxe rooms. The management wants to collect data that indicate the number of rooms that are occupied in each hotel on each
Consider the following information: Susan, 31 years of age, weighs 81kg; Connie, 27 years of age, weighs 50kg; and Alex, 63 years of age, weighs 67kg.a. Use the unstacked format to organize the data.b. Use the stacked format to organize the data.
The amount of monthly data usage by a sample of 10 cell phone users (in MB) was:0.4, 2.7MB, 5.6, 4.3, 11.4, 26.8, 1.6, 1,079, 8.3, 4.2 Are there any potential irregularities in the data?
A study was conducted on the injuries sustained by workers in three different sections at a local factory. The following table shows the data for the first 5 cases out of a total of 25 cases.Case No. Section Cause of Injury Severity of Injury 1 A Fall 3 C Auto 2 3 BB Fall 6 4 B Fall q 5 C Violence
The Dean of Students at a university mailed a survey to a total of 400 students. The sample included 100 students randomly selected from each of the freshman, sophomore, junior, and senior classes on campus.a. What type of sampling was used?b. Explain why the sampling method stated in (a) is the
The owner of an electronic store wants to conduct a survey to measure customer satisfaction for four different brands of washing machine purchased from his store over the past 12 months. His records indicate that 35 customers purchased brand A, 25 purchased brand B, 17 purchased brand C, and 23
The registrar of a university with a population of N = 4,200 full-time students is asked by the president to conduct a survey to measure satisfaction with the quality of life on campus. The following table contains a breakdown of the 4,200 registered full-time students, by gender and class
The manager at a supermarket needs to select 10 out of 55 staff members to attend a professional training seminar. She must be unbiased in her selection. What type of sampling should the manager do? Briefly explain how.
The principal of a school in Mumbai, India, wants to know each students’ favorite subject. The first-grade students will have different subject preferences than the sixth-grade students. Which sampling method should the principal use to conduct an analysis that will deliver precise results?
The head of the student association at Taylor’s University, Malaysia, would like to know what students think of the university website. Since he is unable to get a list of all students enrolled at the university, he and other members of the association stand outside the university’s student
Given a population of N = 93, starting in row 29, column 01 of the table of random numbers (Table E.1), and reading across the row, select a sample of N = 15a. without replacement.b. with replacement.APPLYING THE CONCEPTS
For a population of N = 902, verify that by starting in row 05, column 01 of the table of random numbers (Table E.1), you need only six rows to select a sample of N = 60 without replacement.
For a population containing N = 902 individuals, what code number would you assign fora. the ninth person on the list?b. the twentieth person on the list?c. the last person on the list?
Visit the home page of the Statistics Portal “Statista” at www.statista.com. Examine one of the “Popular infographic topics” in the Infographics section on that page. What type of data source is the information presented here based on?
A study will be undertaken to determine forest growth and yield in China, for which accurate tree height and diameter at breast height (dbh) are important input variables. The area surveyed includes a total of 5503 Chinese Metasequoia trees. What type of data collection source do you think the
Visit the website of the Pew Research organization at www.pewresearch.org. Read today’s top story. What type of data source is the top story based on?
The possible effects of Vitamin C and Vitamin E on health is being studied. Vitamin C is taken in three different amounts of 100 mg, 250 mg, and 500 mg daily. At the same time, Vitamin E can be taken either in 150 mg or 400 mg doses daily. Identify the type of data source based on the above given
The quality controller at a factory that manufactures light bulbs wants to analyze the average lifetime of a light bulb. A sample of 1,000 light bulbs is tested and the average lifetime of a bulb through this sample is found to be 555 hours.a. Identify the population and sample for the
Visit the home page of the Statistics Portal “Statista” at www.statista.com. Examine one of the “Popular infographic topics” in the Infographics section on that page. What type of data source is the information presented here based on?
A study will be undertaken to determine forest growth and yield in China, for which accurate tree height and diameter at breast height (dbh) are important input variables. The area surveyed includes a total of 5503 Chinese Metasequoia trees. What type of data collection source do you think the
Visit the website of the Pew Research organization at www.pewresearch.org. Read today’s top story. What type of data source is the top story based on?
The possible effects of Vitamin C and Vitamin E on health is being studied. Vitamin C is taken in three different amounts of 100 mg, 250 mg, and 500 mg daily. At the same time, Vitamin E can be taken either in 150 mg or 400 mg doses daily. Identify the type of data source based on the above given
The quality controller at a factory that manufactures light bulbs wants to analyze the average lifetime of a light bulb. A sample of 1,000 light bulbs is tested and the average lifetime of a bulb through this sample is found to be 555 hours.a. Identify the population and sample for the
Anna Johnson decides to set up an ice cream booth outside a local high school. However, there are a few things Anna wants to consider before starting her business.a. Indicate the type of data in variable terms (based on the four scales: nominal, ordinal, interval, and ratio) that Anna might want to
If two students both score 90 on the same examination, what arguments could be used to show that the underlying variable—test score—is continuous?
A Wall Street Journal poll asked 2,150 adults in the United States a series of questions to find out their views on the economy.In one format, the poll included the question “How many people in your household are unemployed currently?” In another format of the poll, the respondent was given a
Suppose the following information is collected from Simon Walter on his application for a home mortgage loan.a. Annual personal income: €216,370b. Number of times married: 1c. Ever convicted of a felony: Nod. Own a second car: No Classify each of the responses by type of data.
For each of the following variables, determine whether the variable is categorical or numerical. If the variable is numerical, determine whether the variable is discrete or continuous.a. Number of shopping trips a person made in the past monthb. A person’s preferred brand of coffeec. Time a
The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who purchased the company’s Blu-ray player in the past 12 months are satisfied with their purchase. Classify each of the following variables as discrete,
The following information is collected from students as they exit the campus bookstore during the first week of classes.a. Number of computers ownedb. Nationalityc. Heightd. Dorm hall of residence Classify each of these variables as categorical or numerical. If the variable is numerical, determine
For each of the following variables, determine the type of scale used and whether the variable is categorical or numerical.a. IQ test scoresb. Car brand (Honda, BMW, Proton, and Toyota)c. Students’ performance rating scale (excellent to poor)d. Weight (in kilogram)e. Number of items sold per day
The time it takes to download a video from the Internet is measured.Explain why the download time is a continuous numerical variable.
The age of a newborn baby is zero years old, which is an example of a numerical variable. Explain whether the age of a newborn baby is defined using an interval scale or a ratio scale.
Four different beverages are sold at a fast-food restaurant: soft drinks, tea, coffee, and bottled water.Explain why the type of beverage sold is an example of a categorical variable.
5.132 Greenhouse Effect An environmental issues survey asked the students of a college whether they felt that the main cause of the greenhouse effect is CFCs. It was estimated that 84% of all students felt that it was not so. If another poll was taken and there were 200 participants, how many would
5.131 Opinion about Music A Heartbeats International’s survey in 2011 estimated that 40% of the world’s population thought music is the most difficult to live without in their daily lives. If this rate is still correct and a new poll of 10,000 people were obtained, how many out of those 10,000
5.130 Mutually Exclusive Imagine rolling a red die and a blue die. From this trial, name a pair of mutually exclusive events.
5.129 Independent Imagine rolling a red die and a blue die.From this trial, name a pair of independent events.
5.128 Seat Belt Use In 2009, the National Highway Traffic Safety Administration said that 84% of drivers buckled their seat belts. Assume that this percentage is still accurate. If four drivers are randomly selected, what is the probability that they are all wearing their seat belts?
5.127 UFOs When two people meet, they are sometimes surprised that they have similar beliefs. A survey of 1003 random adults conducted by the Scripps Survey Research Center at Ohio University found that 62 percent of men and 50 percent of women believe in intelligent life on other planets. Well,
5.126 “OR” Suppose you discovered that in a college campus, 40% of the female students were pursuing law and 30% of the female students were pursuing literature.a. From this information, is it possible to determine the percentage of female students who were pursuing law OR literature?b. If your
5.125 “OR” The Times of India reported that 21% of urban households in Delhi own one or more four-wheelers and 38.9% of urban households own one or more two-wheelers. From this information, is it possible to find the percentage of urban households that own a four-wheeler OR a two-wheeler? Why
5.124 Mutually Exclusive Suppose a person is selected at random.Label each pair of events as mutually exclusive or not mutually exclusive.a. The person is a parent; the person is a toddler.b. The person is a woman; the person is a CEO (chief executive officer).
5.123 Mutually Exclusive Suppose a person is selected at random.Label each pair of events as mutually exclusive or not mutually exclusive.a. The person has brown eyes; the person has blue eyes.b. The person is 50 years old; the person is a U.S. senator.
5.122 Cubes A hat contains a number of cubes: 15 red, 10 white, 5 blue, and 20 black. One cube is chosen at random. What is the probability that it is:a. A red cube?b. Not a red cube?c. A cube that is white OR black?d. A cube that is neither white nor black?e. What do the answers to part a and part
5.121 Coin Flips Let H stand for heads and let T stand for tails in an experiment where a fair coin is flipped twice. Assume that the four outcomes listed are equally likely outcomes:HH, HT, TH, TT What are the probabilities of getting:a. 0 heads?b. Exactly 1 head?c. Exactly 2 heads?d. At least 1
5.120 Party, Again Refer to the table for Exercise 5.107.a. Find the probability that a randomly chosen respondent is conservative given that she or he is a Republican.b. Find the probability that a randomly chosen respondent is a Republican given that he or she is conservative.c. Find the
5.119 Political Party, Again Refer to the table for Exercise 5.107.a. Find the probability that a randomly chosen respondent is a Democrat given that he or she is liberal. In other words, what percentage of the liberals are Democrats?b. Find the probability that a randomly chosen respondent is a
5.118 Political Party Use the table in Exercise 5.107. A person is selected randomly from the sample summarized in the table. We want to determine the probability that the person is a moderate Republican. Which of the following statements best describes the problem?i. P(moderate Republican)ii.
5.117 Political Party, Again A person is selected randomly from the sample summarized in the table for Exercise 5.107.We want to find the probability that a conservative person is a Democrat. Which of the following statements best describes the problem? (Choose one.)i. P(conservative Democrat)
5.116 GSS: Mutually Exclusive Referring to the table given in Exercise 5.107, name a pair of events that are not mutually exclusive that could result from selecting an individual at random from this sample.
5.115 GSS: Mutually Exclusive Referring to the table given in Exercise 5.107, name a pair of mutually exclusive events that could result from selecting an individual at random from this sample.
5.114 GSS: OR Assume that one person is chosen randomly from the table given in Exercise 5.107. What is the probability that the person is conservative OR a Republican?
5.113 GSS: OR Assume one person is chosen randomly from the 1858 people in the table given in Exercise 5.107. What is the probability that the person is liberal OR a Democrat?
5.112 GSS: OR Select someone at random from the 1858 people in the table given in Exercise 5.107. What is the probability that the person is liberal OR conservative?
5.111 GSS: OR Select someone at random from the 1858 people in the table given in Exercise 5.107. What is the probability that the person is a Democrat OR a Republican?
5.110 GSS: AND Refer to the table given in Exercise 5.107. Suppose we select a person at random from this collection of 1858 people. What is the probability that the person is liberal AND a Republican? In other words, find P(person is liberal AND person is a Republican).
5.109 GSS: AND Refer to the table given in Exercise 5.107.Suppose we select a person at random from this collection of 1858 people. What is the probability the person is conservative AND a Democrat? In other words, find P(person is conservative AND person is a Democrat).
5.108 GSS: Political Party Refer to the table given in Exercise 5.107.a. If one person is chosen randomly from the group of 1858 people, what is the probability that the person is conservative?b. If one person is chosen randomly from the group of 1858 people, what is the probability that the person

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Essential Statistics Exploring The World Through Data 2nd Global Edition Robert Gould, Colleen N. Ryan, Rebecca Wong - Solutions

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