Chapter 13.7, Problem 1CYP

To determine

Whether the sample is biased, unbiased and describe its type.

Answer to Problem 1CYP

As picking every eighth person from the passengers that carry bags are being inspected. The sample is biased because every eighth person who checks in will have his or her bag inspected hence the sample is biased there is no random selection.

Explanation of Solution

Given:

Passengers carry on the bags which are to be inspected and every eighth person who check’s in his or her bag is inspected.

Solution:

Bias of an estimator is basically the difference between the estimator’s expected value and the original value of the parameter which is calculated.

The estimator which has a zero bias is called as unbiased. It is a random selection.

Conclusion:

Hence, as picking every eighth person from the passengers that carry bags are being inspected. The sample is biased because every eighth person who checks in will have his or her bag inspected hence the sample is biased there is no random selection..

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