MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your R Programming knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If I want to save a plot to a PDF file, which of the following is a correct way of doing that? |
| A. | Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf() |
| B. | Construct the plot on the PNG device with png(), then copy it to a PDF with dev.copy2pdf() |
| C. | Open the PostScript device with postscript(), construct the plot, then close the device with dev.off() |
| D. | Open the screen device with quartz(), construct the plot, and then close the device with dev.off() |
| Answer» B. Construct the plot on the PNG device with png(), then copy it to a PDF with dev.copy2pdf() | |
| 2. |
What does the pch option to par() control? |
| A. | the size of the plotting symbol in a scatterplot |
| B. | the line width in the base graphics system |
| C. | the orientation of the axis labels on the plot |
| D. | the plotting symbol/character in the base graphics system |
| Answer» E. | |
| 3. |
Which function opens the screen graphics device for the Mac? |
| A. | bitmap() |
| B. | quartz() |
| C. | pdf() |
| D. | png() |
| Answer» C. pdf() | |
| 4. |
Bitmapped file formats can be most useful for ____________ |
| A. | Plots that may need to be resized |
| B. | Plots that require animation or interactivity |
| C. | Plots that are not scaled to a specific resolution |
| D. | Scatterplots with many many points |
| Answer» E. | |
| 5. |
Which of the following is an example of a vector graphics device in R? |
| A. | JPEG |
| B. | PNG |
| C. | GIF |
| D. | SVG |
| Answer» E. | |
| 6. |
Which of the following is true about the base plotting system? |
| A. | Margins and spacings are adjusted automatically depending on the type of plot and the data |
| B. | Plots are typically created with a single function call |
| C. | Plots are created and annotated with separate functions |
| D. | The system is most useful for conditioning plots |
| Answer» D. The system is most useful for conditioning plots | |
| 7. |
What is the role of exploratory graphs in data analysis? |
| A. | They are made for formal presentations |
| B. | They are typically made very quickly |
| C. | Axes, legends, and other details are clean and exactly detailed |
| D. | They are used in place of formal modeling |
| Answer» C. Axes, legends, and other details are clean and exactly detailed | |