Each of the following processes involves sampling from a population. Define the

Question

Each of the following processes involves sampling from a population. Define the population, and state whether it is tangible or conceptual.

1) A chemical process is run 21 times and the yield is measured each time

2) The resistance of a certain resistor is measured five times with the same ohmmeter

3) Nine welds are made with the same process, and the strength of each is measured.

4) In a clinical trial to test a new drug that is designed to lower cholesterol, 125 people with high cholesterol levels were recruited to try the mew drug

5) A quality engineer needs to estimate the percentage of wallpaper rolls manufactured on a certain day that are defective. At 4:30 in the afternoon he samples the last 50 rolls to be manufactured.

Explanation / Answer

1. Quantitative measurement unit of the 21 yields is the population. It is tangible, since it is physicaly measarable.

2. 5 times quantitative measurement unit of the resistance is the population. It is conceptual.

3. The measured strength of nine welds is the population. It is tangible.

4. Cholestrol level of 125 people is the population. It is conceptual.

5. 50 rolls is the population. It is tangible.

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