The file Snow contains temperature and snowfall data for 51 major U.S. cities over 30 years. For example, the average low temperature for Columbus, Ohio, is 44 degrees and the average annual snowfall is 27.5 inches.

a. Construct a scatter diagram with the average annual low temperature on the horizontal axis and the average annual snowfall on the vertical axis.

b. Does there appear to be any relationship between these two variables?

c. Based on the scatter diagram, comment on any data points that seem to be unusual.