An officer was tasked to determine the total number of laboratory rooms in need of repair. By drawing lots, ten buildings were randomly selected and all laboratory rooms in each selected building were...

An officer was tasked to determine the total number of laboratory rooms in need of repair. By drawing lots, ten buildings were randomly selected and all laboratory rooms in each selected building were inspected.

What sampling method was used in selecting the building? (Choices: simple random; stratified random; systematic; cluster)

What sampling method was used in selecting the laboratory rooms? (Choices: simple random; stratified random; systematic; cluster)