# Data Visualization with R | Week 4

**Course link : **https://www.coursera.org/learn/data-visualization-r

**These are answers for Data Visualization with R Week 4**

## Final Exam

1. Which function will return an object that represents a world map?

addMap()

addTiles()

leaflet.map()

**leaflet()**

2. What type of chart is a scatter plot?

Comparison

Part to Whole

**Correlation**

Trend

3. What is the difference between a histogram and a bar chart?

A histogram displays the frequency of categorical data, whereas a bar chart displays either ordinal or categorical data.

**A histogram displays the frequency of ordinal data, whereas a bar chart displays categorical data only.**

A histogram displays the frequency of categorical data whereas a bar chart displays ordinal data only.

A histogram displays the frequency of either categorical or ordinal data; whereas a bar chart displays ordinal data only.

4. Which package should be used to create a scatter plot?

**ggplot2**

qplot

ggplot

geom_plot

5. In a box plot, in which quartile does 75% of the sorted data fall below?

First quartile

**Third quartile**

Fourth quartile

Second quartile

**These are answers for Data Visualization with R Week 4**

6. Which function should you use if you want to add markers to display a specific location on a map that you draw?

addCircles()

addProviderTiles()

addTiles()

**addMarkers()**

7. What are trend charts used for?

**To show the distribution of continuous variables.**

To observe the inner nature of a subject in different phases and states of a process.

To visualize differences between elements.

To show the inner subdivision of a value among different categories or groups.

8. Which statement is true about the interquartile range of a data set?

It contains the outliers in a sorted data set.

**It contains the middle 50% of the sorted data.**

It is calculated using the mean.

It is displayed in a histogram.

9. What is the maximum number of bins for sliderInput()?

**50**

100

10

25

10. Which of the following is NOT the purpose of data visualization?

A story conveyed through visuals

Patterns, trends, and anomalies in data

Represent data in the form of graphs, charts, plots, etc.

**Preprocess and clean the data**

**These are answers for Data Visualization with R Week 4**

11. Which graph type helps you visualize the count of categorical or grouped data?

Histograms

Line plots

Scatter plots

**Bar charts**

12. Which package can you use for extra themes and color scales for ggplot2?

tidyverse

**ggthemes**

tidymodels

ggplot

13. Which function is used to construct an initial empty UI when creating a Shiny app?

titlePanel()

mainPanel()

sidebarLayout()

**fluidPage()**

14. Which of the following is NOT a parameter to the varSelectInput() function?

The data frame from which the column names will be retrieved

The input ID that is used to access the value

**The data set variable name**

The display label for the control

15. Using the ggplot() method, which geometry function do you need to use to create a scatterplot?

geom_bar()

geom_dot()

geom_scatter()

**geom_point()**

**These are answers for Data Visualization with R Week 4**

16. Which statement is true regarding box plots?

**It divides the data set into quartiles.**

It displays categorical data.

It displays the mean of the data set.

It obscures the outliers in the data set.

17. Which function arranges elements in a layout with an area for navigation and a main area?

navigationLayout()

navLayout()

navbarLayout()

**sidebarLayout()**

18. Which statement best describes facets?

**Facets subdivide an ordinal data set into panels based on a categorical or discrete variable.**

Facets are used to display ordinal data.

Facets are a type of trend chart.

Facets can only be used with histograms.

19. Which chart type shows the inner subdivision of a value among different categories or groups?

**Part to whole charts**

Comparison charts

Correlation charts

Relationship charts

20. Which chart is a type of comparison chart?

Histogram

**Bar chart**

Scatterplot

Stacked bar chart

**These are answers for Data Visualization with R Week 4**

21. Which data visualization displays information about the distribution of a population?

Pie Chart

Line Plot

**Histogram**

Scatter Plot

22. Which of the following is NOT a Shiny layout function?

fluidRow()

verticalLayout()

**sidebarPanel()**

flowLayout()

23. What does the addTiles() function allow a user to do?

Allows the user to identify a location with longitude and latitude coordinates.

Allows the user to overlay a coordinate grid on a map.

**Allows the user to zoom in on the map.**

Allows the user to add a marker on the map.

24. Which chart is a type of trend chart?

**Line Plot**

Scatter plot

Bar Chart

Pie Chart

25. Which statement best describes the varSelectInput() function?

Provides a title to the side bar panel.

Creates the text for radio buttons.

Creates a drop-down menu.

**Creates a list of values from a data set’s column names.**

**These are answers for Data Visualization with R Week 4**

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