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:

Hall

G. Stanley Hall, an American psychologist and educator who is considered one of the founding figures of child psychology and educational psychology.

Key Transitions

Significant changes or periods of transformation in an individual's life or within a system that mark a passage from one state or phase to another.

Maturity

A state of being fully developed in one's emotional, physical, and intellectual capacities, often associated with adulthood and reasoned decision-making.

G. Stanley Hall

An influential American psychologist and educator best known for his work in developmental psychology and education.