Categorical plots (boxplot, violinplot) in Data Analysis Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a boxplot used for in data analysis?

A boxplot shows the distribution of a dataset by displaying its median, quartiles, and potential outliers. It helps compare groups by visualizing spread and central tendency.

intermediate

What does a violinplot add to the information shown by a boxplot?

A violinplot shows the same summary statistics as a boxplot but also displays the data's density distribution, giving a fuller picture of how data points are spread.

beginner

Which Python library is commonly used to create boxplots and violinplots?

Seaborn is a popular Python library that makes it easy to create boxplots and violinplots with simple commands and good default styles.

intermediate

In a boxplot, what do the whiskers represent?

Whiskers extend from the box to show the range of the data within 1.5 times the interquartile range from the quartiles. Points outside are considered outliers.

intermediate

Why might you choose a violinplot over a boxplot?

Choose a violinplot when you want to see the shape of the data distribution, such as if it is bimodal or skewed, which a boxplot alone does not show.

What does the thick line inside a boxplot represent?

A Mean of the data

B Maximum value

C Median of the data

D Minimum value

The thick line inside the boxplot shows the median, which is the middle value of the data.

Which plot shows data density along with summary statistics?

A Violinplot

B Histogram

C Boxplot

D Scatter plot

Violinplots combine summary statistics with a density plot to show data distribution shape.

In seaborn, which function creates a boxplot?

A sns.histplot()

B sns.violinplot()

C sns.scatterplot()

D sns.boxplot()

sns.boxplot() is the function used to create boxplots in seaborn.

What do outliers look like in a boxplot?

A The box itself

B Dots outside the whiskers

C The median line

D The whiskers

Outliers are shown as dots or points outside the whiskers in a boxplot.

Which plot is better to understand if data is bimodal?

A Violinplot

B Line plot

C Bar plot

D Boxplot

Violinplots show the shape of the data distribution, making it easier to see if data has two peaks (bimodal).

Explain the main differences between a boxplot and a violinplot.

Think about what extra information the violinplot provides beyond the boxplot.

Describe how you would use seaborn to create a boxplot for comparing groups in a dataset.

Remember the basic seaborn plotting steps and parameters.