Identify which one of the four types of validity--measurement validity, statistical conclusion validity, internal validity, or external validityis...

in each of the following scenarios. Explain your decision.  (20 points) In a longitudinal study of exposure to formaldehyde and cancer, people from the Lower Ninth Ward who lived for more than six months in a FEMA trailer following Hurricane Katrina were compared to people whose homes were spared in the elegant Garden District of New Orleans.