Data Analysis Exam 1 Questions and
Answers with Complete Solutions
What is the main purpose of data analysis?
a) To store data in databases
✔✔b) To extract meaningful insights from data
c) To create data visualization charts
d) To avoid data cleaning
What does the term "data wrangling" refer to?
a) Storing data in cloud storage
b) Collecting raw data
✔✔c) Cleaning and transforming raw data into a usable format
d) Analyzing data trends
Which of the following is an example of qualitative data?
a) Sales revenue
b) Number of products sold
✔✔c) Customer satisfaction ratings
1
,d) Website traffic
What is the role of descriptive statistics in data analysis?
a) To predict future outcomes
✔✔b) To summarize and describe the characteristics of a dataset
c) To recommend actions based on the data
d) To test hypotheses
What is the primary goal of hypothesis testing in data analysis?
✔✔a) To determine if there is enough evidence to support a hypothesis
b) To summarize historical data
c) To predict future trends
d) To visualize data
Which of the following is a measure of central tendency?
✔✔a) Mean
b) Variance
c) Standard deviation
2
, d) Range
What is the purpose of data visualization?
✔✔a) To make complex data easier to understand
b) To increase the complexity of data
c) To store data securely
d) To automate data analysis
Which of the following describes an outlier in data analysis?
a) A typical data point within the range
✔✔b) A data point significantly different from the rest of the data
c) The most frequent data value
d) The average of all data points
What is the difference between population and sample in statistics?
✔✔a) A population includes all members of a group, while a sample is a subset
b) A population is a smaller group
c) A sample is always the complete group
3
Answers with Complete Solutions
What is the main purpose of data analysis?
a) To store data in databases
✔✔b) To extract meaningful insights from data
c) To create data visualization charts
d) To avoid data cleaning
What does the term "data wrangling" refer to?
a) Storing data in cloud storage
b) Collecting raw data
✔✔c) Cleaning and transforming raw data into a usable format
d) Analyzing data trends
Which of the following is an example of qualitative data?
a) Sales revenue
b) Number of products sold
✔✔c) Customer satisfaction ratings
1
,d) Website traffic
What is the role of descriptive statistics in data analysis?
a) To predict future outcomes
✔✔b) To summarize and describe the characteristics of a dataset
c) To recommend actions based on the data
d) To test hypotheses
What is the primary goal of hypothesis testing in data analysis?
✔✔a) To determine if there is enough evidence to support a hypothesis
b) To summarize historical data
c) To predict future trends
d) To visualize data
Which of the following is a measure of central tendency?
✔✔a) Mean
b) Variance
c) Standard deviation
2
, d) Range
What is the purpose of data visualization?
✔✔a) To make complex data easier to understand
b) To increase the complexity of data
c) To store data securely
d) To automate data analysis
Which of the following describes an outlier in data analysis?
a) A typical data point within the range
✔✔b) A data point significantly different from the rest of the data
c) The most frequent data value
d) The average of all data points
What is the difference between population and sample in statistics?
✔✔a) A population includes all members of a group, while a sample is a subset
b) A population is a smaller group
c) A sample is always the complete group
3
