Concept explainers
Identify following case whether biased or unbiased: Observing a traffic every six weeks at various times a day so as to widen the outer belt of city.
Answer to Problem 13.7.4EP
Observing a traffic every six weeks at various times a day so as to widen the outer belt of city is an example of voluntary response type biased sample.
Explanation of Solution
Given:
Observing a traffic every six weeks at various times a day so as to widen the outer belt of city.
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 also a systematic random type unbiased sample where traffic is examined every six weeks for a specific time to widen outer belt of city.
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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