data analysis with r programming weekly challenge 4
1. Which of the following are benefits of using ggplot2? Select all that apply.
- Customize the look and feel of your plot
- Easily add layers to your plot
- Combine data manipulation and visualization
- Automatically clean data before creating a plot
2. A data analyst creates a bar chart with the diamonds dataset. They begin with the following line of code:
ggplot(data = diamonds)
What symbol should the analyst put at the end of the line of code to add a layer to the plot?
- pipe operator (%>%)
- plus sign (+)
- equal sign (=)
- ampersand symbol (&)
3. A data analyst creates a plot using the following code chunk:
ggplot(data = penguins) +
geom_point(mapping = aes(x = flipper_length_mm, y = body_mass_g))
Which of the following represents a function in the code chunk? Select all that apply.
- The aes function
- The geom_point function
- the data function
- The ggplot function
4. Fill in the blank: In ggplot2, the term mapping refers to the connection between variables and _____ .
- data frames
- geoms
- facets
- aesthetics
5. A data analyst creates a scatterplot with a lot of data points. The analyst wants to make some points on the plot more transparent than others. What aesthetic should the analyst use?
- Color
- Shape
- Alpha
- Fill
6. You are working with the penguins dataset. You create a scatterplot with the following code:
ggplot(data = penguins) +
geom_point(mapping = aes(x = flipper_length_mm, y = body_mass_g))
You want to highlight the different penguin species on your plot. Add a code chunk to the second line of code to map the aesthetic shape to the variable species.
NOTE: the three dots (...) indicate where to add the code chunk.
Which penguin species does your visualization display?
- Adelie, Chinstrap, Gentoo
- Emperor, Chinstrap, Gentoo
- Adelie, Chinstrap, Emperor
- Adelie, Gentoo, Macaroni
7. A data analyst creates a plot with the following code chunk:
ggplot(data = penguins) +
geom_jitter(mapping = aes(x = flipper_length_mm, y = body_mass_g))
What does the geom_jitter() function do to the points in the plot?
- Adds a small amount of random shapes at each point in the plot
- Decrease the size of each point in the plot
- Adds a small amount of random noise to each point in the plot
- Adds random colors to each point in the plot
8. You are working with the diamonds dataset. You create a bar chart with the following code:
ggplot(data = diamonds) +
geom_bar(mapping = aes(x = color, fill = cut)) +
You want to use the facet_wrap() function to display subsets of your data. Add the code chunk that lets you facet your plot based on the variable clarity.
How many subplots does your visualization show?
- 9
- 6
- 8
- 7
9. Fill in the blank: You can use the _____ function to put a text label on your plot to call out specific data points.
- annotate()
- ggplot()
- facet_grid()
- geom_smooth()
10. You are working with the penguins dataset. You create a scatterplot with the following lines of code:
ggplot(data = penguins) +
geom_point(mapping = aes(x = flipper_length_mm, y = body_mass_g)) +
What code chunk do you add to the third line to save your plot as a png file with “penguins” as the file name?
- ggsave(“penguins”)
- ggsave(penguins.png)
- ggsave(“png.penguins”)
- ggsave(“penguins.png”)
Shuffle Q/A 1
11. In ggplot2, what symbol do you use to add layers to your plot?
- The pipe operator (%>%)
- The plus sign (+)
- The ampersand symbol (&)
- The equals sign (=)
12. A data analyst creates a plot using the following code chunk:
ggplot(data = buildings) +
geom_bar(mapping = aes(x = construction_year, color = height))
Which of the following represents an aesthetic attribute in the code chunk?
- ggplot
- construction_year
- buildings
- x
