Stories

This is the mock questions adapted for Section B of ISDS Final Exam

Description: Fill in the blank with the correct argument name for each plotting task. For each question, identify what argument should replace "argument_x" to achieve the described effect.

1. To set the color of bars in a histogram:

   hist(mtcars$mpg, "argument_x" = "lightblue")
   

2. To specify the plot title:

   plot(dist ~ speed, data = cars, "argument_x" = "Stopping Distance Relative to Car Speed")
   

3. To add a horizontal line at a specific y-value:

   abline("argument_x" = 80, col = "blue")
   

4. To specify the fill color for boxes in a legend (not border color):

   legend("topright", legend = course, "argument_x" = c("blue", "green", "yellow", "red"))
   

5. To increase the size of plot symbols (points):

   plot(dist ~ speed, data = cars, "argument_x" = 1.8)
   

6. What function do you call to finish writing a plot to a file?

   pdf(file = "InsectSpraysBoxplot.pdf", width = 8, height = 5)
   boxplot(count ~ spray, data = InsectSprays, col = "lightgray")
   "argument_x"()
   

7. To set the background color of plot points (requires pch=21-25):

   plot(dist ~ speed, data = cars, pch = 21, "argument_x" = "pink")
   

8. To set the line width in abline():

   abline(lm(dist ~ speed, data = cars), "argument_x" = 3)
   

9. To specify the text entries in a legend:

   legend("top", "argument_x"=c("Tesla", "Facebook"), col=c("#cc33ff", "#0000ff"), lty=1:2)
   

10. To set the box type in a 3D scatter plot:

    scatter3D(x, y, z, "argument_x" = "g", main ="Iris data")
    

11. To specify what type of plot to create (line, point, both):

    plot(y ~ x, data = linePlotDat, "argument_x" = "l")
    

12. To adjust the text size in a legend:

    legend("topright", legend = course, fill = c("blue", "green", "yellow", "red"), "argument_x" = 0.6)
    

13. To specify the subtitle below the main title:

    plot(dist ~ speed, data = cars, main = "Scatterplot", "argument_x" = "Cars")
    

14. To set the alpha (transparency) value in an RGB color:

    c1 <- rgb(173,216,230,max = 255, "argument_x" = 100, names = "lt.blue")
    

15. What function creates a pie chart?

    "argument_x"(x = students, labels = course, main = "ISDS students by course type")
    

16. To set the number of breaks in a histogram:

    hist(mtcars$mpg, "argument_x" = 10)
    

17. To increase the size of axis labels:

    plot(dist ~ speed, data = cars, "argument_x" = 1.25)
    

18. What argument do you need to add a fitted regression line to a scatter plot?

    "argument_x"(lm(dist ~ speed, data = cars))
    

19. To set the line type (dashed, dotted, etc.) in abline():

    abline(lm(dist ~ speed, data = cars), "argument_x" = 5)
    

20. To set the color of points in a scatter plot:

    plot(dist ~ speed, data = cars, "argument_x" = "blue")
    

21. To set the y-axis limits in a plot:

    plot(mH, col = c1, "argument_x" = c(0,50))
    

22. To specify the colors in a legend:

    legend("top", legend=c("Tesla", "Facebook"), "argument_x"=c("#cc33ff", "#0000ff"), lty=1:2)
    

23. To increase the size of the main title:

    plot(dist ~ speed, data = cars, "argument_x" = 2.0)
    

24. To set the maximum value for RGB components:

    c1 <- rgb(173,216,230,"argument_x" = 255, alpha = 100, names = "lt.blue")
    

25. To add a histogram to an existing plot:

    plot(mH, col = c1, ylim = c(0,50))
    plot(fH, col = c2, "argument_x" = TRUE)
    

26. To set the file name when saving a plot as PDF:

    pdf("argument_x" = "InsectSpraysBoxplot.pdf", width = 8, height = 5)
    

27. To increase the size of axis numbers:

    plot(dist ~ speed, data = cars, "argument_x" = 1.1)
    

28. To specify the line types in a legend:

    legend("top", legend=c("Tesla", "Facebook"), col=c("#cc33ff", "#0000ff"), "argument_x"=1:2)
    

29. To set the color of a line in abline():

    abline(lm(dist ~ speed, data = cars), "argument_x" = "red")
    

30. To position a legend in a specific location:

    "argument_x"("top", legend=c("Tesla", "Facebook"), col=c("#cc33ff", "#0000ff"), lty=1:2)
    

31. To set the plot character/symbol type:

    plot(dist ~ speed, data = cars, "argument_x" = 21)
    

32. To assign names to colors in the rgb() function:

    c1 <- rgb(173,216,230,max = 255, alpha = 100, "argument_x" = "lt.blue")
    

33. To specify the label for the x-axis:

    plot(dist ~ speed, data = cars, "argument_x" = "Speed (mph)")
    

34. What function do you need to add a second line to an existing plot?

    plot(x = index(tesla), y = tesla[,6], type = "l", col="#cc33ff")
    "argument_x"(x = index(fb), y = fb[,6], type = "l", col="#0000ff")
    

35. To set the title of a legend:

    legend("topright", legend = course, fill = c("blue", "green", "yellow", "red"), "argument_x" = "Course")
    

36. To set the names for the values in the pie chart:

    pie(x = students, "argument_x" = course, main = "ISDS students by course type")
    

Answers