Questions: Does this describe an observational study or an experiment?

Transcript text: Does this describe an observational study or an experiment?

Solution

Solution Steps

Step 1: Analyze the first scenario (c)

In scenario (c), the quality control specialist inspects the first 20 items they happen to see. This method is convenience sampling, not systematic random sampling, because the selection is based on ease of access rather than a systematic or random process.

Step 2: Analyze the second scenario (d)

In scenario (d), the specialist visits each of the 5 assembly lines and randomly chooses 4 items to inspect. This is stratified random sampling because the population (finished products) is divided into strata (assembly lines), and random samples are taken from each stratum.

Step 3: Analyze the third scenario (e)

In scenario (e), the researcher obtains a list of registered voters and randomly selects 100 names to contact. This is simple random sampling because every registered voter has an equal chance of being selected, and the selection is entirely random.

Final Answer

Scenario (c): Convenience sampling.
Scenario (d): Stratified random sampling.
Scenario (e): Simple random sampling.

\\(\boxed{\text{Answers provided for scenarios (c), (d), and (e)}}\\)

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