Lead is toxic, particularly for young children, and for this reason government regulations

severely restrict the amount of lead in our environment. But this was not always the case. In the early part of the 20th century, the underground water pipes in many U.S. cities contained lead and lead from these pipes leached into drinking water. You must investigate the effect of these lead water pipes on infant mortality from the data file, Lead_Mortality, which contains data on infant mortality, type of water pipes (lead or non-lead), water acidity (pH), and several demographic variables for 172 U.S. cities in 1900.(This is a famous article excel file can be found on the internet)

i) Compute the average infant mortality rate (Infrate) for cities with lead pipes and for cities with non-lead pipes. Is there a statistically significant difference in the averages?