Exploratory Data Analysis

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