Hw 7 #15

Q # 15. (4 pt.) You are reading a study about the relationship between years of heroin use and risk of future overdose. You notice that the researchers randomly selected their sample in a tertiary care emergency room but did not exclude those who were there for treatment for overdose. You are concerned that recruiting at a site that treats patients who have overdosed may overestimate the risk of overdose with this sampling methodology. This could be an example of: 0 Sampling bias 0 Social desirability bias 0 Nonresponse bias 0 Undercmerage