Chapter 18 Multiple choice questions

. Execute the following lines of code:
plot(1:10,rnorm(10),type='p',pch=15,cex=0.5)
points(1:10,rnorm(10),pch=16,cex=0.5)
What is the biggest problem with the graph that is produced?

The tick marks face outwards instead of inwards

The data would be difficult to interpret for individuals who are colourblind

The scaling of the y-axis is uninformative

The symbols are too similar and hard to distinguish

. How might the graph produced by the following lines of code be usefully improved?

plot(rnorm(100),rnorm(100),type='p',pch=15,cex=0.5,xlim=c(-20,20),ylim=c(-20,20))

Plot the data with larger symbols

Reduce the range of the x and y axes so they are more appropriate for the data

Use transparency so that overlapping points are distinguishable

Use logarithmic axes

. Download the data file for the multiple-choice questions for Chapter 18.
Inspect the data in q3data. How would this best be plotted?

On a linear axis because it is normally distributed

On a logarithmic axis because it is positively skewed

On a logarithmic axis because it is negatively skewed

On a logarithmic axis because it contains negative numbers

. Which function would you be most likely to use in creating a raincloud plot from scratch?

density()

hist()

cloud()

boxplot()

. What is the hexadecimal code for blue with 50% transparency?

#0000FFFF

#000080FF

#0000FF80

#00008080

. Which of the following palettes would you use to plot a heatmap of data that are scaled between 0 and 100, such that larger values indicate a greater magnitude? (Hint, you might find the pal.test() function from the pals package helpful).

viridis

kovesi.cyclic_grey_15_85_c0_s25

rainbow

kovesi.cyclic_wrwbw_40_90_c42_s25

. Which of the following palettes would you use to plot a heatmap of phase data that have angular values between 0 and 360 degrees, such that 0 and 360 are identical?

kovesi.rainbow_bgyr_35_85_c72

brewer.rdylbu

kovesi.cyclic_mrybm_35_75_c68_s25

parula

. Which of the following palettes would be most appropriate for ensuring accessibility to people who have tritanopia?

kovesi.linear_bgy_10_95_c74

cividis

ocean.haline

linearl

. Which function would you use to create a vector image?

jpeg()

ps()

png()

postscript()

. How might you represent the standard error for a continuous time-varying curve?

Error bars created using the arrows function

A semi-transparent shaded region

A rectangle displaying the average error across all points

A solid shaded region the same colour as the curve

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