DSCI 4520 EXAM 1 QUESTIONS WITH VERIFIED
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 -
Answers - - 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.. - Answers - 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 - Answers - False
"Identifying segments of similar customers."
Performing this task in data mining requires a supervised learning approach.
True or False - Answers - 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 - Answers - 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."
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 -
Answers - - 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.. - Answers - 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 - Answers - False
"Identifying segments of similar customers."
Performing this task in data mining requires a supervised learning approach.
True or False - Answers - 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 - Answers - 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."
