DSCI 4520 QUIZZES QUESTIONS WITH VERIFIED
ANSWERS
Data mining is an iterative process that data and models shall be updated based on
feedbacks, or new situations, etc. - Answers - True
Which of the following is (are) step(s) in the data mining process? - Answers -
Interpretation/Reporting
Data preparation
Analysis and Evaluation
*All of the above*
Which of the following is NOT a feature of Big Data? - Answers - Users need very
powerful computers to generate data
Which of the following statement is NOT correct? - Answers - The key purpose of
business analytics is to find better machine learning algorithms.
What does the following R code slice?
housing.df[1:5, 3:5] - Answers - The first five rows of third, fourth and fifth variables.
Which of the statement about measurement level is true? - Answers - Interval variables
can be measured as nominal.
The size of a company (in terms of number of employees) is a(n) _________ variable. -
Answers - Ordinal
An interval variable can also be referred as numeric variable. - Answers - True
A variable can also be referred as an attribute, a feature, or a dimension in data mining.
- Answers - True
The variable CAT..MEDV in Boston Housing dataset is a categorical variable. Which of
the following graph is appropriate to explore its frequency counts. - Answers - Bar Chart
A scatter plot is suitable for exploring the relationship between two interval variables. -
Answers - True
The correlation between two interval variables must be within [-1, 1]. - Answers - True
We always discard observations that are statistical outliers (e.g. >3rd quartile +
1.5*Interquartile range). - Answers - False
ANSWERS
Data mining is an iterative process that data and models shall be updated based on
feedbacks, or new situations, etc. - Answers - True
Which of the following is (are) step(s) in the data mining process? - Answers -
Interpretation/Reporting
Data preparation
Analysis and Evaluation
*All of the above*
Which of the following is NOT a feature of Big Data? - Answers - Users need very
powerful computers to generate data
Which of the following statement is NOT correct? - Answers - The key purpose of
business analytics is to find better machine learning algorithms.
What does the following R code slice?
housing.df[1:5, 3:5] - Answers - The first five rows of third, fourth and fifth variables.
Which of the statement about measurement level is true? - Answers - Interval variables
can be measured as nominal.
The size of a company (in terms of number of employees) is a(n) _________ variable. -
Answers - Ordinal
An interval variable can also be referred as numeric variable. - Answers - True
A variable can also be referred as an attribute, a feature, or a dimension in data mining.
- Answers - True
The variable CAT..MEDV in Boston Housing dataset is a categorical variable. Which of
the following graph is appropriate to explore its frequency counts. - Answers - Bar Chart
A scatter plot is suitable for exploring the relationship between two interval variables. -
Answers - True
The correlation between two interval variables must be within [-1, 1]. - Answers - True
We always discard observations that are statistical outliers (e.g. >3rd quartile +
1.5*Interquartile range). - Answers - False
