You have probably seen the mall interviewer, approaching...

Name: Problem 8, Chapter 4: The Practice of Statistics for AP
Uploaded: 2022-03-21T18:10:12-08:00
Duration: 56 s
Channel: Emily Himsel
Description: You have probably seen the mall interviewer, approaching people passing by with clipboard in hand. Explain why even a large sample of mall shoppers would not provide a trustworthy cstimate of the current unemployment rate.

You have probably seen the mall interviewer, approaching people passing by with clipboard in hand. Explain why even a large sample of mall shoppers would not provide a trustworthy cstimate of the current unemployment rate.

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Key Concepts

Selection Bias

Selection bias occurs when the sample collected is not representative of the entire population due to the method of selection. In this context, only interviewing mall shoppers excludes certain segments of the population, such as those who do not go to malls, including many unemployed individuals, leading to a systematic error in the estimate.

Representativeness

Representativeness refers to how well the sample mirrors the larger population. A sample taken solely from mall shoppers will likely miss key demographics and employment statuses, resulting in an estimate of unemployment that does not accurately reflect the true distribution in the general population.

Convenience Sampling

Convenience sampling is a non-random sampling technique where subjects are selected based on ease of access. Relying on mall shoppers is a convenience method that can introduce biases, as it may disproportionately include individuals who are more likely to be employed or less affected by unemployment, thus compromising the trustworthiness of the unemployment rate estimate.

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