Multiple Choices: Based Plot: Histogram

1. Which function in base R is primarily used to create histogram plots?

barplot() histogram() hist() plot()

2. In a histogram plot in R, which argument adjusts the number of bins or intervals?

col breaks bins intervals

3. To color the bars of the histogram in R, which argument can you use within hist()?

color bg col palette

4. What does setting freq = FALSE do when using the hist() function?

Displays the bars with frequencies on the y-axis Displays bars using the density scale on the y-axis Removes the y-axis from the plot Adds relative frequencies as labels to each bar

5. Which of the following options will add a title to the histogram plot?

title main header caption

6. What does the xlim argument in hist(data, xlim = c(10, 100)) control?

The position of the histogram bars The range of the x-axis The width of each bar The height of the histogram

7. To label the x-axis and y-axis of the histogram, which arguments should you use?

xlabel and ylabel xaxis and yaxis xlab and ylab xlab and label

8. If hist(data, right = FALSE) is used, what does the right = FALSE argument control?

It makes the bins left-closed (open on the right side) It hides the right boundary of the plot It centers the bars within each bin It plots the histogram horizontally

9. Which option best describes the purpose of setting prob = TRUE in hist()?

It shows cumulative frequencies on the y-axis It scales the y-axis to probabilities or densities It divides each bin count by the maximum frequency It multiplies each bin count by a probability factor

10. What will the command hist(data, labels = TRUE) do in R?

Adds the count or density value as a label on top of each bar Adds labels to the x and y axes Creates a legend for each bar Changes the color of each bar based on labels

11. What does the argument border control in the hist() function?

The color of the histogram bars The width of the histogram bars The color of the borders around each bar The title of the histogram

12. Which of the following code snippets would set a histogram to display density values and color the bars blue?

hist(data, freq = TRUE, col = "blue") hist(data, prob = TRUE, col = "blue") hist(data, breaks = TRUE, col = "blue") hist(data, density = TRUE, col = "blue")

13. If you want to use the Freedman-Diaconis rule for the number of bins, which argument should you set in hist()?

breaks = "Sturges" breaks = "Scott" breaks = "FD" breaks = 10

14. Which command will add a red vertical line at the mean of the data in a histogram?

abline(h = mean(data), col = "red") lines(mean(data), col = "red") abline(v = mean(data), col = "red") hist(mean(data), col = "red")

15. What does the argument xaxs = "i" do in a histogram?

Expands the x-axis to show all values Sets the x-axis style to be clipped at the plot region limits Inverts the x-axis direction Adds an interval around the x-axis limits

16. If you want to change the label size of the x-axis and y-axis in a histogram, which argument would you use?

cex.axis cex.lab cex.main cex.names

17. Which argument would you use to rotate the labels on the x-axis?

srt las angle dir

18. In the hist() function, which argument can be used to add a subtitle to the histogram?

subtitle sub caption note

19. Which command would add a normal distribution curve to a histogram of data?

curve(dnorm(data), col = "blue") curve(dnorm(x, mean = mean(data), sd = sd(data)), add = TRUE, col = "blue") hist(data, dnorm(data), col = "blue") lines(dnorm(data), col = "blue")

20. In hist(data, plot = FALSE), what does plot = FALSE do?

Plots the histogram without axis labels Plots the histogram in grayscale Returns histogram data without displaying the plot Plots the histogram without any title