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Eyestrain Is Thought to Be Associated with Different Types of Office

question 7

Essay

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!)

Definitions:

Ethical Issue

A situation that requires a person or organization to choose between alternatives that must be evaluated as right (ethical) or wrong (unethical).

Human Subjects

Individuals who participate in research studies, whose rights and welfare are protected by ethical guidelines.

Psychological Damage

Emotional or mental injury caused by experiences of stress, trauma, or abuse that adversely affects an individual’s mental health and well-being.

Construct Validity

The degree to which a test measures what it claims, or purports, to be measuring. It is the degree to which the dependent measure assesses what it intends to assess or the manipulation of the independent variable manipulates what it intends to manipulate.