Questions and Answers of Business Analytics Data

Why is it generally a good idea to prune a full regression tree?a. A full regression tree is too large to visualize.b. A full regression tree typically overfits the training data and pruning the tree
Which of the following statements is true?a. A bagging ensemble is more computationally expensive than a boosting ensemble.b. An ensemble method requires a collection of strong, stable individual
Which of the following statements about ensemble methods is false?a. In a boosting ensemble, the training data for an individual model depends on the predictions of the previously constructed
Which of the following statements about the architecture of a neural network is false?a. The output layer of a neural network for a regression task commonly consists of only one neuron.b. The number
Which of the following statements about neural networks is false?a. It can be very easy to overfit a neural network due to number of weights to be estimated and the number of ways these weights are
Which of the following statements about the training of a neural network is false?a. The training of a neural network is an iterative process of predicting an observation or batch of observations and
Which of the following statements is true?a. Filter methods are guaranteed to determine the best set of variables to include in a model.b. The best subsets method is an example of a wrapper method.c.
Which of the following statements is true?a. Lasso regularization and ridge regularization are different methods for standardizing variables.b. Lasso regularization may prevent overfitting of a
Casey Deesel is a sports agent negotiating a contract for Titus Johnston, an athlete in the National Football League (NFL). An important aspect of any NFL contract is the amount of guaranteed money
A consumer advocacy agency, Equitable Ernest, is interested in providing a service that allows an individual to estimate their own credit score (a continuous measure used by banks, insurance
A consumer advocacy agency, Equitable Ernest, is interested in providing a service that allows an individual to estimate their own credit score (a continuous measure used by banks, insurance
A consumer advocacy agency, Equitable Ernest, is interested in providing a service that allows an individual to estimate their own credit score (a continuous measure used by banks, insurance
A consumer advocacy agency, Equitable Ernest, is interested in providing a service that allows an individual to estimate their own credit score (a continuous measure used by banks, insurance
CD Real Estate specializes in residential real estate services in the state of California. To complement the experience and local market knowledge of its licensed realtors, CD Real Estate wants to
CD Real Estate specializes in residential real estate services in the state of California. To complement the experience and local market knowledge of its licensed realtors, CD Real Estate wants to
CD Real Estate specializes in residential real estate services in the state of California. To complement the experience and local market knowledge of its licensed realtors, CD Real Estate wants to
CD Real Estate specializes in residential real estate services in the state of California. To complement the experience and local market knowledge of its licensed realtors, CD Real Estate wants to
CD Real Estate specializes in residential real estate services in the state of California. To complement the experience and local market knowledge of its licensed realtors, CD Real Estate wants to
Palanquin Auto is a national pre-owned car retailer that offers an online marketplace for customers interested in purchasing a preowned automobile. In an effort to reduce price negotiation, Palanquin
Palanquin Auto is a national pre-owned car retailer that offers an online marketplace for customers interested in purchasing a preowned automobile. In an effort to reduce price negotiation, Palanquin
Palanquin Auto is a national used car retailer that offers an online marketplace for customers interested in purchasing a preowned automobile. In an effort to reduce price negotiation, Palanquin
Palanquin Auto is a national pre-owned car retailer that offers an online marketplace for customers interested in purchasing a pre-owned automobile. In an effort to reduce price negotiation,
Palanquin Auto is a national pre-owned car retailer that offers an online marketplace for customers interested in purchasing a pre-owned automobile. In an effort to reduce price negotiation,
It is estimated that nearly half of all users of the social networking platform TikTok in the United States were between the ages of 10 and 29 in 2020 (Statista.com website). Suppose that the results
Consider the random experiment of rolling a pair of six-sided dice. Suppose that we are interested in the sum of the face values showing on the dice.a. How many outcomes are possible?b. List the
Only 15 college basketball programs have won more than a single NCAA Basketball Championship. Those 15 colleges are shown below along with their current NCAA Conference Affiliation and the number of
More than 1.5 million tests for the COVID virus were performed each day in the United States during the COVID-19 pandemic in 2021. Many employers, schools, and government agencies required negative
Internal auditors are often used to review an organization’s financial statements such as balance sheets, income statements, and cash flow statements prior to public filings. Auditors seek to
According to the American Veterinary Medical Association (AVMA), 38.4% of households in the United States own a dog as a pet (AVMA website). Suppose that a company that sells dog food would like to
The book Code Complete by Steve McDonnell estimates that there are 15 to 50 errors per 1,000 lines of delivered code for computer programs.Assume that for a particular software package, the error
The United States Centers for Disease Control and Prevention (CDC) recommends that adults sleep seven to nine hours per night (CDC.gov website).However, many adults in the United States sleep less
Laffy Taffy is a type of taffy candy made from corn syrup, sugar, palm oil, and other ingredients. Laffy Taffy comes in a variety of flavors including strawberry, banana, and cherry. Suppose that
Which of the following statements about principal component analysis is true?a. A strength of PCA is the interpretability of its output.b. At least four components are necessary to satisfactorily
What is an appropriate choice of distance metric for observations consisting of binary variables for which matching zeroes do not correspond to similarity?a. Matching distanceb. Jaccard distancec.
When may cosine distance be a good choice to measure differences between observations?a. When dealing with observations with variables with both quantitative and categorical variables.b. When dealing
Which of the following is a true statement about the comparison of Euclidean distance versus Manhattan distance?a. Manhattan distance is distorted less by outlier observations.b. Euclidean distance
Which of the following statements about hierarchical clustering is true?a. Because of its nested design, hierarchical clustering will find the set of k clusters that maximizes the average silhouette
What is a recommended criterion to determine the number of clusters in a k-means approach?a. Silhouette score.b. Elbow method.c. Corresponding set of k clusters has an intuitive interpretation and
Which of the following statements about the single linkage method is false?a. In two dimensions, resulting clusters tend to be compact and circular.b. In two dimensions, the resulting clusters can be
If one wants to attempt to keep the largest difference between two observations in a cluster as small as possible, which linkage method may be most appropriate?a. Complete linkageb. Single linkagec.
When creating association rules, why is it common to only consider rules with a confidence measure above a minimum threshold?a. A minimum confidence threshold is not necessary if item granularity is
In a transactional data, what is the effect of aggregating similar items into a broader product category?a. Item granularity does not matter as one can simply adjust the minimum support threshold.b.
Which of the following statements about lift is false?a. Lift can be interpreted as how much more likely the antecedent and consequent itemsets occur together than if they were totally unrelated.b.
When creating association rules, why is it common to only consider rules with a support measure above a minimum threshold?a. Rules with too low of a support are unlikely to be true.b. Rules with too
In transactional data, what are virtual items?a. Items involved in association rules with a high lift measure.b. Items corresponding to transactions occuring in a virtual reality setting.c. Product
What is a benefit of using TFIDF instead of just term frequency in text mining?a. TFIDF can be used in a bag-of-words approach, but term frequency cannot.b. TFIDF is a normalized measure that
Which of the following distance measures is commonly applied to a frequency-document matrix and why?a. Jaccard distance—because text is expressed as binary variables in a frequencydocument
Which of the following is NOT usually included in the tokenization of text?a. Removal of punctuation and symbolsb. Generation of a word cloudc. Removal of stopwordsd. Stemming words
The Boleyn sisters, a pair of entrepreneurs who recently sold their start-up for a multi-million- dollar sum, are looking for alternate investments for their newfound fortune. They are considering an
Jay Gatsby categorizes wines into one of three clusters. The centroids of these clusters (in standardized units), describing the average characteristics of a wine in each cluster, are listed in the
Sol & Nieve is a sporting good and outdoor gear retailer that operates in North America and Central America. In an attempt to characterize its stores and reassess Sol & Nieve’s supply chain
Heidi Zahn is a human resources manager currently reviewing data on 98 employees. In the data, each observation consists of an employee’s age and an employee’s performance rating.a. Heidi applied
The Football Bowl Subdivision (FBS) level of the National Collegiate Athletic Association (NCAA) consists of over 100 schools.Most of these schools belong to one of several conferences, or
Leggere, an Internet book retailer, is interested in better understanding the purchase decisions of its customers. For a set of 1,604 customer transactions, it has categorized the individual book
Freelance reporter Irwin Fletcher is examining the historical voting records of members of the U.S. Congress. For 175 representatives, Irwin has collected the voting record (yes or no) on 16 pieces
Porridge Foods is a health-foods company considering a venture in the breakfast foods market. As part of its market research, Porridge Foods has collected data on 11 quantitative variables for 77
The file congress contains the voting record sample from the U.S. House of Representatives. These data include the voting record for 445 representatives on 1647 issues with votes recorded as 21 for
IBM employs a network of expert analytics consultants for various projects. To help it determine how to distribute its bonuses, IBM wants to form groups of employees with similar performance
Attracted by the possible returns from a portfolio of movies, hedge funds have invested in the movie industry by financially backing individual films and/or studios. The hedge fund Star Ventures is
The Football Bowl Subdivision (FBS) level of the National Collegiate Athletic Association (NCAA) consists of over 100 schools. Most of these schools belong to one of several conferences, or
As a guide in establishing standard management guidelines for similar national parks, the National Park Service is interested in clustering the data on 59 national parks in the file parks. Use the
Stuart Rankin, manager of the specialty store All Things Scottish, is interested in devising a way to recommend different types of Scotch whisky to customers based on their preferences among Scotches
The online review service Yelp helps millions of consumers find the goods and services they seek. To help consumers make more-informed choices, Yelp includes over 120 million reviews. The file yelp
ZipRecruiter periodically issues reports on wages of entry-level workers. They reported that entry-level wages for college graduates who took jobs in Deer Park, California were $$23.69$ per hour
Forty-two percent of primary care doctors think their patients receive unnecessary medical care.a. Suppose a sample of 300 primary care doctors was taken. Show the distribution of the sample
Which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli, and rice bought at the grocery store is $$23.04$. A sample of 100 neighborhood restaurants showed a mean price
According to the Congressional Research Service, 2,191,011 people are employed by the federal government in the United States. Suppose that a random sample of 3,500 of these federal employees was
ABC News reports that 58% of U.S. drivers admit to speeding.Suppose that a new satellite technology can instantly measure the speed of any vehicle on a U.S. road and determine whether the vehicle is
Millions of high school graduates decide annually to enroll in a college or university. Many factors can influence a student’s choice of where to enroll.List the five steps of the decision-making
Entrepreneur magazine ranks franchises. Among the factors that the magazine uses in its rankings are growth rate, number of locations, start-up costs, and financial stability. A recent ranking listed
The following 20 observations are for two quantitative variables, x and y.a. Create a scatter chart for these 20 observations.b. Fit a linear trendline to the 20 observations. What can you say about
The file colleges contains the following data for the sample of 102 private colleges: year founded, tuition and fees (not including room and board), and the percentage of undergraduates who obtained
Red Sky Delivery performs “last-mile” delivery services for online retailers such as Amazon. Red Sky employs delivery drivers who deliver packages to individual residence and business locations
The file beveragedistributor contains data on the monthly revenue for a large regional distributor of beverages.a. Create a line chart to depict the revenue time series at the annual level. What
Blatt Consulting Services is interested in comparing the number of customer accounts managed by its consultants. The chart below is a default chart produced in Excel.a. Which preattentive attributes
The following stock chart shows stock price performance for Coca-Cola over a two-week period. Note that May 16 and May 17 are a Saturday and a Sunday and are non-trading days.a. Which day seems to
Bravman Clothing sells high-end clothing products and is launching a service in which they use a same-day courier service to deliver purchases that customers have made by working with one of their
In this problem we revisit the data from Bravman Clothing in Problem 22. The file bravman which contains 25 observations consisting of the wait time the customer experienced during the order process,
The United States Census Bureau tracks shifts in population by each state and region in the United States. The net migration rate is an indicator of the movement of people from one area to another. A
An income statement is a summary of a company’s revenues and costs over a given period time. The data in the file bellevuebakery is an example of an income statement. It contains the revenues and
The Drucker Institute ranks corporations for managerial effectiveness based on a composite score derived from the following five factors: customer satisfaction, employee engagement and development,
Ecologists often measure the biodiversity of a region by the number of distinct species that exist in the region. Nature reserves are lands specifically designated by the government to help maintain
Omaha Steaks is a food retailing company that specializes in mail order delivery of beef. The company is headquartered in Omaha Nebraska and was founded as a butcher shop in 1917. Omaha Steaks wants
The President of the United States is elected based on the electoral college. Each state in the United States has a specified number of electoral votes. Typically, the candidate that wins the popular
List the steps of data wrangling and explain what is done in each step.
Each month, Morgan Fabrication receives csv files from its facilities in Detroit, Albany, and Providence. These files summarize production in each facility for each day during the previous month, and
Lush&Green Lawn Services employs four lawn treatment specialists: Penny Esposito, Garland Falkland, Peter Raft, and Baozhai Suen. Each specialist drives a truck equipped with a small computer they
Brugha Research Associates (BRA) just completed a controlled store test of a proposed new packaging for the Aussie brand of cookies. BRA collected eight weeks of pretest period sales data for Aussie
The Accounting Department at van Dyke Industries has produced a data set of the company’s quarterly sales revenue for the past five years in an unstacked arrangement. These data are provided in the
Laghari & Laghari’s Personnel Department maintains a file of all employees of the company and each employee’s unique Employee ID. The file llemployees provides information on employees for
Teller Crackers & Snacks (TCS) recently held a contest in which it awarded each of ten randomly drawn entrants a large box of assorted crackers each week for a year. The names and addresses of the
Bickley Academy is a competitive private college preparatory high school. Bickley’s administration is now considering applications from the three local junior high schools: Montgomery, Cleeghorn,
The Gulf Shore Blue Crabs minor league baseball team wants to create a new identification system for its season ticket holders using information in the file bluecrabs. The file contains the first and
The North Atlantic Consortium of Nephrology Associations(NACNA) is made up of two professional societies, the North American Nephrologist Society (NANS) and the European Council on Nephrology (ECN).
Valley of the Grape is a show about wine and winemaking that is available on streaming services throughout the United States.Kleskin & Relouk (K&R), producers of Valley of the Grape, generate revenue
Bustamante & Sons (B&S), Inc. publishes a small line of textbooks for introductory undergraduate business courses. Deron Ackerman, Director of Sales for B&S, is now performing annual reviews of the
Tomlinson’s Lumens, Inc. (TLI) is a large manufacturer of lighting fixtures and parts. TLA’s Accounting department receives files tomlinsonprices and tomlinsonunits that summarize the price and
Donald Midkif, a data scientist with Khatri, Inc. has been tasked with determining in which of the largest U.S. cities the products Khatri manufactures and distributes are most popular as measured by
A local PrimoVision Eyewear store maintains a file named primoappts that contains the customer ID number and date of most recent appointment for each of its customers. The store also maintains a file
Sweet Bayou Airlines (SBA) flight 494 departs daily from Shreveport for Nashville at 8:47 a.m. The manager of the SBA office in Shreveport must receive a file that combines to contents of the file

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