Answer:
The correct option is 2. The student should use scatter plot to display their data.
Explanation:
It is given that the students measure their heights, arm lengths, and stride lengths to determine whether there is a relationship among the values.
Line graph: Line graph is a continuous graph, which is generated by connecting the points of scatter plot. Generally, they are used to describe the value of something over time.
Scatter plot: The data points are plotted in a coordinate plane. Where each point defines the value of y with respect to x. Scatter plot is used for random data.
Bar graph: It is used to compare changes between different groups or data over the time.
Histogram: It is used to describe the frequency of continuous data.
The measure of their heights, arm lengths, and stride lengths is a random data. So, the student should use scatter plot to display their data.
Therefore, the correct option is 2.