ISYE 6501 - MIDTERM 1 NEWEST ACTUAL

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ISYE 6501 - MIDTERM 1 NEWEST ACTUAL

EXAM COMPLETE QUESTIONS AND

CORRECT DETAILED ANSWERS

(VERIFIED ANSWERS) |ALREADY GRADED

A+||BRAND NEW VERSION!!

Question : What do descriptive questions ask?

CORRECT ANSWER : What happened? (e.g., which

customers are most alike)

Question : What do predictive questions ask?

CORRECT ANSWER : What will happen? (e.g., what will

Google's stock price be?)

Question : What do prescriptive questions ask?

CORRECT ANSWER : What action(s) would be best? (e.g.,

where to put traffic lights)

Question : What is a model?

CORRECT ANSWER : Real-life situation expressed as math.

Question : What do classifiers help you do?

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CORRECT ANSWER : differentiate

Question : What is a soft classifier and when is it used?

CORRECT ANSWER : In some cases, there won't be a line

that separates all of the labeled examples. So we use a classifier that minimizes the number of mistakes.

Question : What does it mean when the classifier/decision

boundary is almost parallel to the vertical x-axis?

CORRECT ANSWER : The horizontal attribute is all that is

needed.

Question : What does it mean when the classifier/decision

boundary is almost parallel to the horizontal y-axis?

CORRECT ANSWER : The vertical attribute is all that is

needed.

Question : What is time-series data?

CORRECT ANSWER : The same data recorded over time

often recorded at equal intervals

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Question : What is quantitative data?

CORRECT ANSWER : Number with a meaning: higher means more, lower means less (e.g., age, sales, temperature, income)

Question : What is categorical data?

CORRECT ANSWER : Numbers w/o meaning (e.g., zip

codes), non-numeric (e.g., hair color), binary data (e.g., male/female, yes/no, on/off)

Question : Which of these is time series data?

• The average cost of a house in the United States every year

since 1820

• The height of each professional basketball player in the NBA

at the start of the season

CORRECT ANSWER : A

Question : Which of these is structured data?

• The contents of a person's Twitter feed
• The amount of money in a person's bank account

CORRECT ANSWER : B

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Question : What is structured data?

CORRECT ANSWER : Data that can be stores in a structured

way

Question : What is unstructured data?

CORRECT ANSWER : Data that is not easily described and

stored (e.g., written text)

Question : A survey of 25 people recorded each person's family

size and type of car. Which of these is a data point?

• The 14th person's family size and car type
• The 14th person's family size

C.The car type of each person

CORRECT ANSWER : A. A data point is all the information

about one observation

Question : The farther the wrongly classified point is from the

line ___

CORRECT ANSWER : The bigger the mistake we've made