DSCI 4520 EXAM 1 REVIEW 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."
Performing this task in data mining requires an unsupervised learning approach.
, True or False - Answers - 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 - Answers - 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 - Answers - Regression
ANOVA is an analysis under which of the following data mining task categories?
- Dimension reduction
- Data cleaning
- Data exploration
- Visualization - Answers - Data exploration
Which of the following statements is INCORRECT about imputing missing numerical
values?
- Random generator function is one of the best methods of imputing
- The median value of the variable can be used for imputing
- The mean value of the variable can be used for imputing
- Linear regression model can be used for imputing - Answers - Random generator
function is one of the best methods of imputing
Transforming numerical variables means performing mathematical functions on them
and creating new variables that are better suited for our data mining model.
True or False - Answers - True
When data is not uniformly distributed and includes outliers, linear normalization is
recommended.
True or False - Answers - False
Which of the following tasks is NOT included in the data preprocessing phase?
- Handling missing data
- Data standardization
- Performance evaluation
- Data aggregation - Answers - Performance evaluation
In statistics and data mining, "a statistical measure of the strength of the relationship
between the relative changes of two variables" is called ...
- Trend Line
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."
Performing this task in data mining requires an unsupervised learning approach.
, True or False - Answers - 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 - Answers - 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 - Answers - Regression
ANOVA is an analysis under which of the following data mining task categories?
- Dimension reduction
- Data cleaning
- Data exploration
- Visualization - Answers - Data exploration
Which of the following statements is INCORRECT about imputing missing numerical
values?
- Random generator function is one of the best methods of imputing
- The median value of the variable can be used for imputing
- The mean value of the variable can be used for imputing
- Linear regression model can be used for imputing - Answers - Random generator
function is one of the best methods of imputing
Transforming numerical variables means performing mathematical functions on them
and creating new variables that are better suited for our data mining model.
True or False - Answers - True
When data is not uniformly distributed and includes outliers, linear normalization is
recommended.
True or False - Answers - False
Which of the following tasks is NOT included in the data preprocessing phase?
- Handling missing data
- Data standardization
- Performance evaluation
- Data aggregation - Answers - Performance evaluation
In statistics and data mining, "a statistical measure of the strength of the relationship
between the relative changes of two variables" is called ...
- Trend Line
