51. which of the following functions can be used to finely control the appearance of all lattice plots ?
52. . . . . . . . . function is used to simulate binary random variables.
53. . . . . . . . . display contours of a 3d surface in 2d.
54. . . . . . . . . modify a ggplot or theme object by adding on new components.
55. How many functions exist for tidying the data?
56. . . . . . . . . uses regex groups instead of a splitting pattern or position.
57. . . . . . . . . generate aesthetic mappings that describe how variables in the data.
58. If I want to save a plot to a PDF file, which of the following is a correct way of doing that?
59. Which of the following is an example of a vector graphics device in R?
60. You can time . . . . . . . . expressions by wrapping them in curly braces within the call to system.time().
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