How Many Observations Should Be Made If the Analyst Wants

question 15

Multiple Choice

How many observations should be made if the analyst wants to be 99.74 percent confident that the maximum error in the observed time is two seconds? Assume that the standard deviation of task times is 4 seconds.

• A) 5
• B) 6
• C) 25
• D) 36
• E) 49

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Definitions:

Cretaceous Period

A division of Earth’s history lasting from about 145 to 66 million years ago, marked by the dominance of dinosaurs and the appearance of flowering plants.

Gymnosperms

Seed-producing plants such as conifers that do not have flowers or fruit, with seeds often exposed or on the surface of scales or leaves.

Bryophytes

Non-vascular plants that include mosses, liverworts, and hornworts, characterized by their life cycle stages and lack of vascular tissue.

Ferns

A group of non-flowering plants that reproduce via spores and have large, divided leaves known as fronds.