You’d like to estimate the mean size of families in your community. Explain why you’ll tend to get a smaller sample mean if you sample n families than if you sample n individuals (asking them to report their family size). (When you sample individuals, explain why you are more likely to sample a large family than a small family. To think of this, it may help to consider the case n = 1 with a population of two families, one with 10 people and one with only 2 people.)
Answer to relevant QuestionsBiologists and naturalists often use sampling to estimate sizes of populations, such as deer or fish, for which a census is impossible. Capture–recapture is one method for doing this. A biologist wants to count the deer ...Use the Random Numbers applet on the text CD to select 10 of the 60 school district accounts described in Example 5. Explain how you did this, and identify the accounts to be sampled. A February 2, 2003, Atlanta Journal Constitution article about the bleak job market for graduating MBA students described an opinion survey conducted by a graduate student at a major state university. The student polled 1500 ...Give an example of a survey that would suffer from a. Sampling bias due to the sampling design b. Sampling bias due to under coverage c. Response bias d. Non-response bias Consider the same setting as that of Exercise 4.39. Of the 100 participants, 45 are male and 55 are female. During the design of the study, one member of the research team suggests that all males be given the active drug and ...
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