Identify which of these types of sampling is used: cluster, convenience, simple

Question

Identify which of these types of sampling is used: cluster, convenience, simple random, systematic or stratified. Justify.

a)A stat 200 professor wants to estimate the study hours of his students. He teaches two sections, and plans on randomly selecting 10 students fromthe first section and 14 students formthe ssecond section.

b) A Stat 200 student is interested in the number of credit cards owned by college students. She surveyed all of her classmates to collect sample data.

c)The quality control department of a semiconductor manufacturing complany tests every 100th product from the assemply line.

d) On the day of the last presidential election, UMUC News Club origanized an exit poo in which specific polling stations were randomly selected and all voters were surveyed as they left those polling stations.

Explanation / Answer

a)A stat 200 professor wants to estimate the study hours of his students. He teaches two sections, and plans on randomly selecting 10 students fromthe first section and 14 students formthe ssecond section.

It is cluster sampling since he divides the section in to two clusters

b) A Stat 200 student is interested in the number of credit cards owned by college students. She surveyed all of her classmates to collect sample data.

This is simple random sampling

c)The quality control department of a semiconductor manufacturing complany tests every 100th product from the assemply line

This is systematic sampling. SInce we are testing every k th product

d) On the day of the last presidential election, UMUC News Club origanized an exit poo in which specific polling stations were randomly selected and all voters were surveyed as they left those polling stations.

This is also simple random sampling

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