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WorksheetsExploratory Data Analysis
Total questions: 20
Worksheet time: 10mins
What is the role of exploratory graphs in data analysis?
Axes, legends, and other details are clean and exactly detailed.
They are typically made very quickly.
They are made for formal presentations.
Only a few are constructed.
If I want to save a plot to a PDF file, which of the following is a correct way of doing that?
Construct the plot on the PNG device with png(), then copy it to a PDF with dev.copy2pdf().
Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()
Open the screen device with quartz(), construct the plot, and then close the device with dev.off().
Open the PostScript device with postscript(), construct the plot, then close the device with dev.off().
Data Analysis is a process of?
inspecting data
cleaning data
transforming data
All of the options
How many main statistical methodologies are used in data analysis?
2
3
4
5
In descriptive statistics, data from the entire population or a sample is
summarized with ?
integer descriptors
floating descriptors
numerical descriptors
decimal descriptors
Which of the following is true about hypothesis testing?
answering yes/no questions about the data
estimating numerical characteristics of the data
describing associations within the data
modeling relationships within the data
Which of the following is true about exploratory data analysis?
answering yes/no questions about the data
estimating numerical characteristics of the data
describing associations within the data
modeling relationships within the data
Which of the following is true about regression analysis?
answering yes/no questions about the data
estimating numerical characteristics of the data
describing associations within the data
modeling relationships within the data
Text Analytics, also referred to as Text Mining?
TRUE
FALSE
Can be TRUE or FALSE
Cannot say
Data Analytics uses ---------- to get insights from data
Statistical figures
Numerical aspects
Statistical methods
None of the mentioned above
Linear regression analysis is used to predict the value of a variable based on
the value of another variable
TRUE
FALSE
___ are used when we want to visually examine the relationship between
two quantitative variables
Bar graph
Scatter plot
Line graph
Pie chart
A graph that uses vertical bars to represent data is called a ____
Bar graph
Scatter plot
Line graph
Pie chart
For each value of the ___, the distribution of the dependent variable must
be normal
Independent variable
Depended variable
Intermediate variable
None of the given
If the populations mean return is equal to zero, then it is called as ...............
Null Hypothesis
Alternate Hypothesis
Simple Hypothesis
None of the given
Correlation is the relationship between ------------ variables
one
two
zero
all the given
Predictive analytics involves taking historical data
TRUE
FALSE
___ are the basic building blocks of qualitative data
Categories
Data chunk
Numeric figures
None of the mentioned
Tableau and PowerBI are ________ tools
Visualization
Analytical
Data Exploration
All of the mentioned
Outliers can be identified by ________
Bar chart
Box plot
Scatter plot
All of the given
