Exploratory Data Analysis Quiz 1 (JHU) Coursera

Question 1

Which of the following is a principle of analytic graphics?

Make judicious use of color in your scatterplots (NO)
Don't plot more than two variables at at time (NO)
Show box plots (univariate summaries) (NO)
Only do what your tools allow you to do (NO)
Show comparisons

Answer Options:
Integrate multiple modes of evidence
Show comparisons

Question 2

What is the role of exploratory graphs in data analysis?

They are made for formal presentations.
Only a few are constructed.
They are typically made very quickly.
Axes, legends, and other details are clean and exactly detailed.

Answer Options:
They are typically made very quickly.

Question 3

Which of the following is true about the base plotting system?

Plots are typically created with a single function call
Margins and spacings are adjusted automatically depending on the type of plot and the data
Plots are created and annotated with separate functions
The system is most useful for conditioning plots

Answer Options:
Plots are created and annotated with separate functions

Question 4

Which of the following is an example of a valid graphics device in R?

A file folder (NO)
The computer screen
A Microsoft Word document (NO)
A socket connection (NO)
The keyboard (NO)

Answer Options:
The computer screen
A PNG file

Question 5

Which of the following is an example of a vector graphics device in R?

GIF
TIFF
Postscript
PNG
JPEG

Answer Options:
Postscript or SVG

Question 6

Bitmapped file formats can be most useful for

Plots that require animation or interactivity
Scatterplots with many many points
Plots that may need to be resized
Plots that are not scaled to a specific resolution

Answer:
Scatterplots with many many points

Question 7

Which of the following functions is typically used to add elements to a plot in the base graphics system?

hist()
plot()
text()
boxplot()

Answer Options:
text() or points()

Question 8

Which function opens the screen graphics device on Windows?

postscript()
windows()
jpeg()
xfig()

Answer:
windows()

Question 9

What does the 'pch' option to par() control?

the size of the plotting symbol in a scatterplot
the plotting symbol/character in the base graphics system
the orientation of the axis labels on the plot
the line width in the base graphics system

Answer:
the plotting symbol/character in the base graphics system

Question 10

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 screen device and then copy it to a PDF file with dev.copy2pdf()
Construct the plot on the PNG device with png(), then copy it to a PDF 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().

Answer:
Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()

mGalarnyk/quiz1.md