Quiz
This lesson is called Quiz, part of the R in 3 Months (Fall 2026) course. This lesson is called Quiz, part of the R in 3 Months (Fall 2026) course.
Test your knowledge with the questions below. Answers are not scored and do not affect your certification at the end of the program, so feel free to try as many times as you need. If you have any questions, don't hesitate to use the comments field or to contact Gracielle by email.
Quiz
Which code should I use to define the color of the contour line of my column plot?
The color argument is the one that changes the contour color of the bars and any geom with this property (e.g., some shapes in geom_points, geom_bar, geom_col). The fill property changes the filling color of the geoms.
The scale_fill_* family of functions map a scale of colors to the fill aesthetics, and so it does not change the color of the contour of bars.
The fill argument change the colors of the fill aesthetics, and so it does not change the color of the contour of bars.
The fill argument change the colors of the fill aesthetics, and so it does not change the color of the contour of bars.
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Chris Mouzong • March 23, 2026
Does this quiz have a correct answer?
Gracielle Higino Coach • March 23, 2026
Thanks for noticing, Chris! I just fixed it and now we can see the correct answer.