Concept explainers
Identify following case whether biased or unbiased: Surveying every 3rd person exiting a grocery store to obtain popular fish for eating.
Answer to Problem 13.7.1EP
Surveying every 3rd person exiting a grocery store to obtain popular fish for eating is an example of systematic random type unbiased sample.
Explanation of Solution
Given:
Surveying every 3rd person exiting a grocery store to obtain popular fish for eating.
Calculations:
Here, we have to justify whether given example is biased or unbiased.
Biased samples are the samples that are most likely to be considered than others in whole population.
Unbiased samples are the samples in which almost all members are included in the population
Given example is systematic random type unbiased sample in which peoples are selected randomly in time intervals.
In systematic sampling, all elements in a population are counted and every nth element is chosen for inspection.
Conclusion:
Therefore, we are able to define whether given sample is biased or unbiased.
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