DSCI 4520 EXAM 1 QUESTIONS AND
CORRECT ANSWERS
Which of the following tasks is an unsupervised learning task?
- Predicting customers loyalty
- Grouping customers based on the similarity in their online behavior
- Predicting customers retention
- Forecasting customers spending ✅✅CORRECT ANSW-Grouping customers based on the
similarity in their online behavior
"Predicting whether a company will go bankrupt based on comparing its financial data to those of
similar bankrupt and non bankrupt firms."
Performing this task in data mining requires an unsupervised learning approach.
True or False ✅✅CORRECT ANSW-False
Which of the followings is a core idea/task in data mining?
- Data cleaning and pre-processing
- All of the others
- Regression modeling
- Data visualization ✅✅CORRECT ANSW-All of the others
"Learn from the observed records to predict numerical values of unseen records."
In data mining, this is called ...
- Classification
- Regression
- Clustering
- Segmentation ✅✅CORRECT ANSW-Regression
Which statement about the data mining process is INCORRECT?
- No value presents in raw, unprocessed, and unactionable data
- Data cleaning and pre-processing is usually a trivial step in the process
, - The overall objective of any data mining process is to improve the business
- Data mining is a multidisciplinary field that makes a significant use of statistics ✅✅CORRECT
ANSW-- Data cleaning and pre-processing is usually a trivial step in the process
According to the data-driven decision-making technology pyramid shown in the following figure,
which statement is FALSE?
- At the bottom of the pyramid are transactional data management systems moderated and
operated by database analyst and admins (DBA).
- The process only moves in one direction (upward) and higher layers never give feedback to the
lower layers.
- Raw operational data in OLTP systems are transformed to OLAP in data warehouse systems.
- As data moves from the bottom of the pyramid to the top it transforms into information,
knowledge, and actionable insights.. ✅✅CORRECT ANSW-The process only moves in one direction
(upward) and higher layers never give feedback to the lower layers.
"Estimating the repair time required for an aircraft based on a trouble ticket."
Performing this task in data mining requires an unsupervised learning approach.
True or False ✅✅CORRECT ANSW-False
"Identifying segments of similar customers."
Performing this task in data mining requires a supervised learning approach.
True or False ✅✅CORRECT ANSW-False
Data exploration includes summary statistics, univariate and bivariate analysis, basic statistical tests
(t-test, correlation), ANOVA, and outlier detection.
True or False ✅✅CORRECT ANSW-True
ANOVA is an analysis under which of the following data mining task categories?
- Dimension reduction
- Data cleaning
- Data exploration
CORRECT ANSWERS
Which of the following tasks is an unsupervised learning task?
- Predicting customers loyalty
- Grouping customers based on the similarity in their online behavior
- Predicting customers retention
- Forecasting customers spending ✅✅CORRECT ANSW-Grouping customers based on the
similarity in their online behavior
"Predicting whether a company will go bankrupt based on comparing its financial data to those of
similar bankrupt and non bankrupt firms."
Performing this task in data mining requires an unsupervised learning approach.
True or False ✅✅CORRECT ANSW-False
Which of the followings is a core idea/task in data mining?
- Data cleaning and pre-processing
- All of the others
- Regression modeling
- Data visualization ✅✅CORRECT ANSW-All of the others
"Learn from the observed records to predict numerical values of unseen records."
In data mining, this is called ...
- Classification
- Regression
- Clustering
- Segmentation ✅✅CORRECT ANSW-Regression
Which statement about the data mining process is INCORRECT?
- No value presents in raw, unprocessed, and unactionable data
- Data cleaning and pre-processing is usually a trivial step in the process
, - The overall objective of any data mining process is to improve the business
- Data mining is a multidisciplinary field that makes a significant use of statistics ✅✅CORRECT
ANSW-- Data cleaning and pre-processing is usually a trivial step in the process
According to the data-driven decision-making technology pyramid shown in the following figure,
which statement is FALSE?
- At the bottom of the pyramid are transactional data management systems moderated and
operated by database analyst and admins (DBA).
- The process only moves in one direction (upward) and higher layers never give feedback to the
lower layers.
- Raw operational data in OLTP systems are transformed to OLAP in data warehouse systems.
- As data moves from the bottom of the pyramid to the top it transforms into information,
knowledge, and actionable insights.. ✅✅CORRECT ANSW-The process only moves in one direction
(upward) and higher layers never give feedback to the lower layers.
"Estimating the repair time required for an aircraft based on a trouble ticket."
Performing this task in data mining requires an unsupervised learning approach.
True or False ✅✅CORRECT ANSW-False
"Identifying segments of similar customers."
Performing this task in data mining requires a supervised learning approach.
True or False ✅✅CORRECT ANSW-False
Data exploration includes summary statistics, univariate and bivariate analysis, basic statistical tests
(t-test, correlation), ANOVA, and outlier detection.
True or False ✅✅CORRECT ANSW-True
ANOVA is an analysis under which of the following data mining task categories?
- Dimension reduction
- Data cleaning
- Data exploration
