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

question 36

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?

---

Definitions:

SCDs

Sequential Compression Devices; medical devices used to promote blood flow in the legs by applying sequential pressure.

Lower Extremity Circulation

The circulation of blood in the lower limbs of the body, which is crucial for delivering oxygen and nutrients to leg tissues and removing waste products.

Foot Cradle

A device placed at the end of a bed to keep bed sheets and blankets off the feet and legs, often used for individuals with sensitive skin or poor circulation.

Lateral Position

A body position where the person lies on their side, often used in medical settings for patients having difficulty breathing or to prevent aspiration.