Radioactive waste disposal as well as the production of radioactive material in some mining operations are creating a serious pollution problem in some areas of the United States. State health officials have decided to investigate the radioactivity levels in one suspect area. Two hundred points in the area are randomly selected and the level of radioactivity is measured at each point. Answer questions (a), (b), (c), and (d) in Exercise 1.1 for this sampling situation.
REFERENCE:
1.1 : Selecting the proper diet for shrimp or other sea animals is an important aspect of sea farming. A researcher wishes to estimate the mean weight of shrimp maintained on a specific diet for a period of 6 months. One hundred shrimp are randomly selected from an artificial pond and each is weighed.
a. Identify the population of measurements that is of interest to the researcher.
b. Identify the sample.
c. What characteristics of the population are of interest to the researcher?
d. If the sample measurements are used to make inferences about certain characteristics of the population, why is a measure of the reliability of the inferences important?
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