Question

To estimate the percentage of defects in a recent manufacturing​ batch, a quality control manager at General Electric selects every 19th refrigerator that comes off the assembly line starting with the seventh until she obtains a sample of 70 refrigerators. What type of sampling is used? (a) Simple random (b) Systematic (c) Cluster (d) Convenience (e) Stratified

Answer 1

Option B - Systemic

Explanation:

Looking at the question and the options, i can tell it is a systematic random sampling.

This is because, a systematic random sampling is a type of sampling method where samples are chosen from a larger population based on a random beginning point that has a definite and periodic interval.

We are told that a quality control manager selects every 19th refrigerator that comes off the assembly line starting with the sixth until she obtains a sample of 70 refrigerators.

This means that;

Periodic interval is Every 19th

Beginning point is every 7th

Sample size is 70

Hence, this type of sampling is a systematic random sampling.