A Coffee Shop Franchise Owner Is Looking at Two Possible $\sigma$

question 37

Essay

A coffee shop franchise owner is looking at two possible locations for a new shop.To help make a decision the owner looks at the number of pedestrians that go by each of the two locations in one-hour segments.At location A,counts are taken for 35 one-hour units and with a mean number of pedestrians of 421 and a sample standard deviation of 122.At the second location (B),counts are taken for 50 one hour units with a mean number of pedestrians of 347 and a sample standard deviation of 85.Assume the two populations variances are not known but are equal,and that the number of pedestrians is approximately normal.
-Calculate the pooled estimate of $\sigma$
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Definitions:

Epithelial

Pertaining to the epithelium, a layer of cells covering the body surfaces, lining hollow organs, and forming glands.

Nervous

Relating to the nervous system, which is the network of nerve cells and fibers that transmits nerve impulses between parts of the body.

Haversian Canals

Microscopic tubes or channels within the bone that contain blood vessels and nerves; part of the bone's vascular and innervation system.

Canaliculi

Small, channel-like structures in bones that allow for communication and nutrient exchange between osteocytes.