A Quality Control Engineer Wants to Determine What Proportion of Defective

question 23

Short Answer

A quality control engineer wants to determine what proportion of defective parts are coming off the assembly line. Past experiments based on large sample sizes show this proportion to be 0.19. What sample size does the engineer need in order to estimate this proportion with a margin of error of 0.12 with 90% confidence?
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Definitions:

Hygiene Factors

Elements related to job conditions that can lead to dissatisfaction if absent, but do not necessarily motivate employees when present, as per Herzberg's Two-Factor Theory.

Job Dissatisfaction

The feeling of unhappiness or discontent with one's job, stemming from various factors such as working conditions, pay, or lack of fulfillment.

ERG Theory

A motivational theory developed by Clayton Alderfer that categorizes human needs into three groups: Existence, Relatedness, and Growth.

Activated Needs

Activated needs are desires or requirements that have been triggered by internal or external stimuli, prompting individuals to take action.