
Concept explainers
Identify following case whether biased or unbiased: Polling of members of Blog society for checking popularity of blogging.

Answer to Problem 13.7.3EP
Polling of members of Blog society for checking popularity of blogging is an example of voluntary response type biased sample.
Explanation of Solution
Given:
Polling of members of Blog society for checking popularity of blogging.
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 voluntary response type biased sample as only members of blog society are polled instead of any other member outside the society.
Conclusion:
Therefore, we are able to define whether given sample is biased or unbiased.
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