You Want to Estimateσ for the Population of Waiting Times $\sigma$

question 40

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 $\sigma$ Find the minimum sample size. Is this
sample size practical?

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Definitions:

Independent

Free from outside control or influence, able to make decisions or act according to one's own principles.

Homeowner's Policy

An insurance policy providing coverage for damage to a person's home and possessions within, as well as liability for accidents that occur in the home or on the property.

Independent

A term in statistics that describes two or more variables which do not influence or affect each other.

Independent

Not influenced by or connected to others; in statistics, it often implies that variables are not correlated.