Different pharmaceutical companies are doing studies in their search for the COVID-19 vaccine. Suppose that "Goodbye COVID-19." a possible candidate for the vaccine, is under study. This is given to patients admitted to different Philippine hospitals diagnosed with COVID-19. Researchers are interested in getting the mean length of days patients are in quarantine facility before clearing the virus. They started giving the vaccine to two different sets of 50 patients from the onset of their illness until they are cured. The data collected was submitted to the Department of Science and Technology for evaluation. In this study, suppose the researchers selected the sample by dividing the patients according to their BMI and then taking several patients per BMI classification. The type of sampling used here is _________. a. stratified b. cluster c. systematic d. random
Different pharmaceutical companies are doing studies in their search for the COVID-19 vaccine. Suppose that "Goodbye COVID-19." a possible candidate for the vaccine, is under study. This is given to patients admitted to different Philippine hospitals diagnosed with COVID-19. Researchers are interested in getting the mean length of days patients are in quarantine facility before clearing the virus. They started giving the vaccine to two different sets of 50 patients from the onset of their illness until they are cured. The data collected was submitted to the Department of Science and Technology for evaluation. In this study, suppose the researchers selected the sample by dividing the patients according to their BMI and then taking several patients per BMI classification. The type of sampling used here is _________.
a. stratified
b. cluster
c. systematic
d. random
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