Hello, dear friend, you can consult us at any time if you have any questions, add WeChat: zz-x2580
Customer Analytics (Practice) Final Exam
NO COMMUNICATION WITH OTHERS IS PERMITTED
The Carey Business School measures success by the way a Carey graduate stands out as an
innovative business leader and exemplary citizen. The Carey community believes that honesty,
integrity, and community responsibility are qualities inherent in an exemplary citizen. The objective
of the Carey Business School Honor Code is to create an environment of trust among all members
of the academic community while the qualities associated with success are developed in students.
The Honor Code requires that each student act with honesty and integrity in all academic and co-
curricular activities and that each student endeavor to hold his or her peers to the same standard.
Upon witnessing an alleged violation of the Honor Code, a student is expected to inform either the
responsible faculty member or the Honor Council of both the alleged violation and the name of the
student accused of committing the alleged violation. Each member of the Carey community, as a
person of integrity, has a personal obligation to adhere to this requirement. It is only by upholding
the Honor Code that members of the entire Carey community can contribute to the School’s ability
to maintain its high standards and its reputation.
Violations of this agreement are viewed as serious matters that are subject to disciplinary sanctions
imposed by the Honor Council of the Carey Business School, which is composed of a fair
representation of part-time and full-time MBA, MS, BS and BBA students and faculty members.
• No interpersonal communication.
• To answer questions, make assumptions if necessary.
• Fill-in your answers into the “EXAM_ANSWERS.docx” template. Do not exceed the allotted
number of lines.
• Continuously save your work. Make sure you upload the correct file and that upload is
successful.
• Submit the file with answers via the “Final exam” link in the assignments tab in Blackboard.
This link expires 2 minutes after due time. In this event, email submission to instructor
([email protected]). Late submissions face a per-minute point penalty.
1. [8 points] Consider the following sample corpus from Yelp. Each row (review) is a
document. Assume the list of stopwords = c(“so”, “or”, “when” “and”, “the”) and non-
words contain white space, punctuation, numbers, and symbols (e.g. $).
[1] All the food is great here. But the best thing they have is their wings. Their wings are simply fantastic!!
[2] This place is truly a Yinzer's dream!! \"Pittsburgh Dad\" would love this place n'at!!
[3] Wing sauce is like water. Pretty much a lot of butter and some hot sauce (franks red hot maybe).
[4] The whole wings are good size and crispy, but for $1 a wing the sauce could be better.
[5] The fish sandwich is good and is a large portion, sides are decent.
(1) [4 points] After removing non-words and stopwords, what is the TF-IDF score of the
term “good” in doc 4?
(2) [4 points] If we use this corpus to predict restaurants’ survival rate, is there a “wide X”
problem? Why or why not. Please explain.
2. [8 points] Suppose that your work for the marketing division of the athletic apparel
company Reebok. You are now discussing the allocation of advertising dollars. In a
meeting, the chart shown below is presented. This chart describes the relationship between
the number of times Facebook users see an ad for Reebok shoes (horizontal axis) and the
probability that users will purchase a pair of Reebok shoes after clicking on the link
(vertical axis). Your colleague presents this figure in a meeting, arguing that it provides
“undisputable evidence that advertising on Facebook pays-off” and that the company
should “probably increase the number of advertising dollars in this platform.” Do you
agree? Explain your argument.
