Which of these is a useful plot for identifying a potential relationship between two variables of a process?

Which of these is a useful plot for identifying a potential relationship between two variables of a process? Correct Answer Scatter diagram

A scatter diagram is a very useful plot between two variables which affects the manufacturing process. To identify any potential relationship between the two variables, scatter diagram is a very useful tool.
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Related Questions

Assertion (A): When there is an evidence of a linear relationship between two variables, it may not always mean an independent-dependent relationship between the two variables.
Reason (R): The casual relationship between the two variables may not imply a reasonable theoretical relationship between the two.
A student has created a plot of y(t)=t2. He is need to show another graph of z(t)=t3 in the same plot. But every time he hits the plot() function- MATLAB generates a plot of z(t) vs t but on a different window. What is the error?