Author Question: What statistics and graphs can you use to look for a relationship between two interval ... (Read 67 times)

jon_i · **on:** Jun 24, 2018

What statistics and graphs can you use to look for a relationship between two interval variables?

Question 2

What statistics and graphs can you use to answer the following question: Is the distribution symmetric? If not, is it skewed? If symmetric, is it bell shaped?

rachel · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

Scatter diagrams, covariance, the coefficient of correlation, and the coefficient of determination are useful techniques for detecting relationships between two interval variables.

Answer to Question 2

A histogram can show you whether a distribution is symmetric, positively skewed, negatively skewed, or has a different shape. If the data is symmetric, a histogram can tell you whether the data is bell shaped, bimodal, or uniform, etc. A box plot can also show you whether a distribution is symmetric, negatively skewed or positively skewed. However, it can't tell you what the exact shape is, if the data are found to be symmetric. For example, a box plot cannot tell you whether a symmetric data set is unimodal or bimodal. This is a drawback of a box plot.