Hello folks, I was informed that some of you haven\'t received their books yet,

Question

Hello folks, I was informed that some of you haven't received their books yet, so I'm posting the problem statements for this time only. For the next assignments I'll post the problem numbers as usual. Each of the following processes involves sampling from a population. Define the population, and state whether it is or conceptual. c. In a clinical trial to test a new drug that is designed to lower 100 people with high cholesterol levels are recruited to try the new drug. d. Eight concrete specimens are constructed from a new formulation, and the compressive strength of each is measured. e. A quality engineer needs to estimate the percentage of bolts manufactured on a certain day that meet a strength specification. At 3.00 in the afternoon he samples the last 100 bolts to be manufactured. True or false: a. A simple random sample is guaranteed to reflect exactly the population from which it was drawn. b. A simple random sample is free from any systematic tendency to differ from the population from which it was drawn.

Explanation / Answer

c. The population is people with high cholestrol levels.
As, people with high cholestrol levels physically exists, they are tangible population.

d.
The population is concrete specimens.
The population is conceptual and consists of set of concrete specimens that will result from a new formulation as may times as it will ever be run.

e.
The population is bolts manufactured.
As, bolts manufactured physically exists, they are tangible population.

a. A simple random sample is guaranteed to reflect exactly the population from which it was drawn.

False - A simple random sample may differ from the population due to sampling variation.

b. A simple random sample is free from any systematic tendency to differ from the population from which it was drawn.

True - A simple random sample is free from any systematic tendency to differ from the population from which it was drawn.

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