Researchers collected data from 100 randomly chosen counties in Texas on pollution levels and asthma rates. Pollution levels were measured by calculating the average number of air particulates (in mg/m) and asthma rates were calculated as the percent of residents (0-100 %) diagnosed with asthma. After confirming all relevant assumptions, they ran a linear model predicting asthma

rates based on pollution level:

Std. Estimate Error (Intercept) 3.61 2.05 pollution 2.11 0.90