A Time Study of a Certain Service Task Found an Average

question 83

Essay

A time study of a certain service task found an average time of 15 minutes and a standard deviation of 5, with a standard sample large enough that we are 95% confident that standard time is within 5% of its true value? Was a sample of 125 large enough?

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Definitions:

Mare

A dark, low-lying, relatively smooth area on the Moon consisting of basalt.

Lunar Highlands

Rough, mountainous regions on the moon's surface, characterized by their lighter color and higher altitude than the lunar maria.

Mare

Latin for "sea," often used to describe the large, dark basaltic plains on the Moon, formed by ancient volcanic eruptions.

Lunar Highlands

Elevated, mountainous regions on the moon's surface, characterized by high albedo, heavy cratering, and made predominantly of anorthosite.