Question 1 • Probability and Statistics with Applications Honors Sem-1-FL-1210300 (2024-2025)
A factory produces plastic parts used to fit in car dashboards. It is important that the parts are produced with the correct dimensions, or they may not fit in the car dashboard. To ensure that the parts are being made correctly, a sample of parts is checked and measured each day. Which of the following methods would not represent a convenience sample?
Answer
A
Right after lunch, the first 25 parts are inspected.
B
Fifty parts are chosen at random from the many parts made each day.
C
At the end of the day, a container of 30 parts is inspected and measured.
D
The first 20 parts produced after the start of the day are inspected and measured.
Explanation
A convenience sample is selected because the items are easy or readily available to inspect. The first parts after lunch, the last parts in a container, and the first parts of the day are all chosen based on when they are available. Choosing 50 parts at random gives each part a chance to be selected, so it is not a convenience sample.
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