Scatter plots in Data Analysis Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a scatter plot?

A scatter plot is a graph that shows points representing values for two different variables. It helps us see if there is a relationship or pattern between them.

beginner

Which Python library is commonly used to create scatter plots?

Matplotlib is a popular Python library used to create scatter plots easily with the function plt.scatter().

beginner

How do you add labels to the axes in a scatter plot using Matplotlib?

Use plt.xlabel('X label') and plt.ylabel('Y label') to add labels to the x-axis and y-axis respectively.

beginner

What does it mean if points in a scatter plot form a clear upward trend?

It means there is a positive correlation: as one variable increases, the other tends to increase too.

intermediate

How can you change the color and size of points in a scatter plot in Matplotlib?

Use the c parameter to set colors and s parameter to set sizes in plt.scatter(). For example, plt.scatter(x, y, c='red', s=50).

What does each point in a scatter plot represent?

A A pair of values from two variables

B A single value from one variable

C The average of all data points

D A summary statistic

Each point shows one value from each of the two variables, plotted on x and y axes.

Which function creates a scatter plot in Matplotlib?

A plt.plot()

B plt.hist()

C plt.scatter()

D plt.bar()

plt.scatter() is used specifically for scatter plots.

If points in a scatter plot are randomly spread with no pattern, what does it suggest?

A Strong positive correlation

B No clear relationship

C Strong negative correlation

D Data error

Random spread means no clear relationship between variables.

How can you add a title to a scatter plot in Matplotlib?

A plt.title('My Title')

B plt.label('My Title')

C plt.name('My Title')

D plt.header('My Title')

Use plt.title() to add a title to your plot.

Which parameter controls the size of points in plt.scatter()?

A marker

B c

C size

D s

The s parameter sets the size of points.

Explain how to create a basic scatter plot in Python using Matplotlib.

Think about the steps from importing the library to displaying the plot.

Describe what a scatter plot can tell you about the relationship between two variables.

Focus on what the pattern of points means.