A city planning committee surveys 100 people waiting at a bus stop about the expansion of the public transportation system.
Is this an example of a: random sample, systematic sample, self-selected sample, convenience sample, bipartisan sample, or stratified random sample?
I think that it's an example of a convenience sample.
Volunteers stop to survey residents of every fourth house from the end of each block in town.
Is this an example of a: random sample, systematic sample, self-selected sample, convenience sample, bipartisan sample, or stratified random sample?
I think that it's an example of a systematic sample.
For the first scenario, where a city planning committee surveys 100 people waiting at a bus stop, you correctly identified it as a convenience sample. In a convenience sample, the individuals are selected based on their accessibility and availability. In this case, the committee chose individuals who were readily available at the bus stop.
For the second scenario, where volunteers stop to survey residents of every fourth house from the end of each block in town, it is not a systematic sample. Instead, it is an example of a systematic sample. In a systematic sample, individuals are selected based on a pre-determined pattern or system. In this case, the volunteers used a systematic approach by selecting every fourth house from the end of each block to survey.