i.
Identify following case whether biased or unbiased: Checking every fifth TV for its quality.
i.
Answer to Problem 13PT
Checking every fifth TV coming out of assembly line for its quality is an example of systematic unbiased sample.
Explanation of Solution
Given:
Every fifth TV coming out of assembly line is checked for its quality.
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 TV’s are selected as per time intervals.
In systematic sampling, all elements in a population are counted and every n th element is chosen for inspection.
Conclusion:
Therefore, we are able to define whether given sample is biased or unbiased.
ii.
Identify following case whether biased or unbiased: Surveying every tenth person leaving the library after opening new book store.
ii.
Answer to Problem 13PT
Surveying every tenth person leaving the library after opening new book store is systematic unbiased sample.
Explanation of Solution
Given:
Surveying every tenth person leaving the library after opening new book store.
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 peoples are surveyed as per time interval.
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.
Chapter 13 Solutions
Pre-Algebra, Student Edition
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