Eyestrain Is Thought to Be Associated with Different Types of Office

question 27

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 personnel. Previous research has shown that approximately 21% of full time data entry personnel have eyestrain, and Acme would like to estimate the proportion, π, of their 6,000 part-time data entry employees that have eyestrain.
a) They would like to estimate π to within 0.05 with 95% confidence. If they accept the starting value of 0.21 as a reasonable initial estimate of π, what sample size should they use for their study?
b) Suppose Acme had felt that the working conditions of their temporary data entry personnel were 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!)

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Definitions:

Do...While Loop

The do...while loop in programming executes a block of code once, and then repeats the execution as long as the specified condition evaluates to true.

Exit Condition

A condition or statement that determines when a loop or recursive function should stop executing to prevent infinite loops or recursion.

Entry Condition

A precondition or requirement that must be met before the execution of a certain block of code or function.

Break Statement

The break statement terminates the current loop, switch, or label statement and transfers control to the code following the terminated statement.