In this example we use the typical sales price of homes in a random sample of us counties (recorded with units as $1000 per square foot) to predict the typical rental cost in the county (in units of $ per square foot) . y: the typical rental cost in the county ($ per square foot). x: the typical sales price of properties in the county ($1000 per square foot). assume we compare the counties a and b. county a has a sales price of properties at $45 per square foot higher than county b. what is the difference in the variable x for these two counties?the variable x is recorded in a dataset to be higher for county a compared to county b.