The California Health Interview Survey (CHIS) is the nation\'s largest statewide

Question

The California Health Interview Survey (CHIS) is the nation's largest statewide telephone health survey. The CHIS has been conducted biennially since 2001 using a two-stage process that is designed to generate a sample that represents the state. At the first stage, telephone numbers are drawn within predefined geographic areas. Telephones numbers are screened to determine if they are contained in households and are thus eligible for the survey. At the second stage, one adult is randomly selected among all adults living in a household. What type of sampling method is used?

Explanation / Answer

The above sampling method is two stage telephonic random sampling method.

The families who have telephone are the first stage sample units and then the adults iin the families are second stage sampling units.

Since the telephone numbers selected randomly and then the adults from the selected families are also choosen randomly so the sampling method is random.

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