Neighborhoods of size 1000 were randomly sampled from three different cities (populations): New York, LA, and Washington. The number of crimes occurred in the last five years in each neighborhood were recorded. The average annual income in each neighborhood was also recorded as an index of financial well-being. (The data are attached)
For the combined sample decide whether or not it is possible to use average income to predict crime rates in North American cities. If so, decribe the relationship algebraically.