[Verified Answer]: i conducted a study of people who inject…

i conducted a study of people who inject drugs to determine the likelihood of individuals using clean needles when they use their drug of choice. i survey every third client of a local syringe exchange program. which provides clean needles, during one full day of operation to gather my data for this study, based solely on the information given what kind of bias would you determine i’ve intriduced into my samole with this design