DSCI 4520 EXAM 1 REVIEW EXAM ACTUAL QUESTIONS AND
ANSWERS
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
ANSWER✅✅- 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 ANSWER✅✅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 ANSWER✅✅False
"Identifying segments of similar customers."
Performing this task in data mining requires a supervised learning approach.
True or False - CORRECT ANSWER✅✅False
, 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 ANSWER✅✅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 ANSWER✅✅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 ANSWER✅✅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 ANSWER✅✅Regression
ANOVA is an analysis under which of the following data mining task categories?
- Dimension reduction
- Data cleaning
ANSWERS
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
ANSWER✅✅- 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 ANSWER✅✅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 ANSWER✅✅False
"Identifying segments of similar customers."
Performing this task in data mining requires a supervised learning approach.
True or False - CORRECT ANSWER✅✅False
, 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 ANSWER✅✅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 ANSWER✅✅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 ANSWER✅✅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 ANSWER✅✅Regression
ANOVA is an analysis under which of the following data mining task categories?
- Dimension reduction
- Data cleaning
