Researchers are conducting a study of visual acuity (using an eye chart to test people's eyesight). To do this they go to a large Walmart and ask shoppers if they would like to participate in their study. What type of sampling is this? O Convenience sampling O Cluster sampling O Simple random sampling O Stratified sampling O Consecutive sampling Question 7 1 pts Often in conducting multi-centered (multiple locations) Randomized-Controlled Trials, individuals are recruited for a study from a study site until there are enough individuals for the study. For example, in a COVID-19 Phase 3 randomized-controlled trial, a clinic might recruit high risk healthcare workers (i.e. Nurses working in the Emergency Department) non-randomly for the study. Recruitment of individuals continues on an ongoing bases until a quota (target) number of study subjects is achieved. What kind of sampling is this? Simple random sampling Convenience sampling Consecutive sampling Stratified sampling Cluster sampling