The population is divided into homogeneous subgroups, and then individuals are randomly selected from each subgroup. What type of sampling is this?
ASimple random
BStratified random
CCluster
DSystematic random
A study was conducted to investigate the relationship between COPD and smoking. Data was collected from government hospital records on COPD cases and cigarette sales records from finance and taxation departments. What is the study design?
ACross-sectional study
BOperational study
CCase-control study
DEcological study
Admission rate bias is?
AReporting bias
BResponse bias
CBerksonian bias
DNone of the options
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