Quality engineers at an industrial fastener company, Tighten Up, are responsible
ID: 3043547 • Letter: Q
Question
Quality engineers at an industrial fastener company, Tighten Up, are responsible for assessing product quality. One product of interest is a certain type of bolt produced in the tens of thousands and sold to auto manufacturers and their suppliers across the country. To assess the quality of the current shipment of 10,000 bolts being sent to My Motors, inspectors obtain 150 bolts from the shipment and subject them to various quality tests and measurements to determine thread pitch, which is the distance from one thread groove to the next, measured from crest to crest.
What is the population for the current shipment to My Motors?
A. Tens of thousands of bolts
B. Sample of 150 bolts
C. Any shipment of 10,000 bolts
D. Current shipment of 10,000 bolts
For each of the following, select the best description of the sampling strategy employed in the given situation. If you are uncertain of your answer, provide an explanation for your best choice.
Body Mass Index (BMI) is a useful measure of overall fitness in adults. In an effort to assess the overall fitness level of residents in a certain community, a researcher selects a sample of the first 20 citizens entering the local gym wearing white socks on a given day.
A. Simple Random Sampling
B. Stratified Sampling
C. Non-random Sampling
Explanation / Answer
a) Option- D) current shipment of 10,000 bolts
b) Option-A) simple random sampling