A Watchdog Group Is Investigating How People Are Treated During

Multiple Choice

A watchdog group is investigating how people are treated during the foreclosure process. Surveys were mailed to a random sample of 300 people who had recently been threatened with foreclosure.
75 of the surveys were returned by the postal service because the intended recipients had moved
And left no forwarding address. What type of problem has occurred?

A) selection bias
B) nonresponse bias
C) measurement error