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Eyestrain is thought to be associated with different types of office work. The Acme Temp-Help Company provides short-term employees to substitute for vacationing data entry workers. Previous research has shown that approximately 21% of full time data entry workers have eyestrain, and Acme would like to estimate the proportion, p, of their 6,000 part-time data entry employees that have eyestrain.
A) They would like to estimate p to within 0.05 with 95% confidence. If they accept the value of 0.21 for full-time data entry workers as a reasonable initial estimate of p, what sample size should they use for their study?
B) Suppose Acme believed that the working conditions of their temporary data entry personnel are different enough that they should not depend on the 0.21 as an initial estimate. In a few sentences, explain how your procedure for choosing a samples size would differ from your solution in part (a). (Do NOT recalculate a new estimate of the necessary sample size!)
Self-Punishment
The act of inflicting pain or harm upon oneself as a form of dealing with feelings of guilt or inadequacy.
Coronary Heart Disease
A condition characterized by reduced blood flow to the heart muscle due to the buildup of plaque in the coronary arteries.
Blood Flow
The continuous circulation of blood through the heart and blood vessels, delivering nutrients and oxygen to the body.
Coronary Arteries
Blood vessels that supply blood and oxygen to the heart muscle, crucial for the heart's function and overall health.
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