On Each of the Previous 25 Days, 100 Electronic Devices

question 38

Essay

On each of the previous 25 days, 100 electronic devices of a certain type were randomly selected and subjected to a severe heat stress test. The total number of items that failed to pass the test was 570.
a. Determine control limits for a 3-sigma p chart.
b. The highest number of failed items on a given day was 40, and the lowest number was 12. Does either of these correspond to an out-of-control point? Explain.

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Definitions:

Phobia

An anxiety disorder marked by a persistent, irrational fear and avoidance of a specific object, activity, or situation.

Spiders

Arachnids characterized by eight legs and the ability to spin webs, often inducing fear or fascination.

Histrionic Personality Disorder

A mental disorder characterized by a pattern of excessive attention-seeking behaviors, usually beginning in early adulthood, including inappropriate seduction and an excessive need for approval.

OCD

Obsessive-Compulsive Disorder (OCD) is a mental health disorder characterized by recurring, unwanted thoughts (obsessions) and repetitive behaviors (compulsions) that a person feels compelled to perform.