You Want to Estimate σ for the Population of Waiting

question 26

Essay

You want to estimate σ for the population of waiting times at McDonald's drive-up windows, and you want to be 95% confident that the sample standard deviation is with 20% of σ. Find
the minimum sample size. Is this sample size practical?

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Definitions:

Researchers

Individuals who conduct detailed studies and investigations in order to discover new information or reach new understandings.

History Effects

External events that occur outside of an experiment that can affect the behavior or responses of participants in the study, potentially confounding results.

Control Group

In experimental research, a group of subjects that does not receive the experimental treatment and is used as a baseline to compare the effects of the treatment.

Persuasive Communication

The process of using messages to influence the beliefs, attitudes, or behaviors of others.