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A group of biologists wish to study the life span of the common housefly. They want to estimate the ...

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A group of biologists wish to study the life span of the common housefly. They want to estimate the ...

A group of biologists wish to study the life span of the common housefly. They want to estimate the mean life span with 80% confidence and a width on the interval of estimation no greater than 1 hr. How many samples should they draw if a previous study indicates that the standard deviation of life span is 2.43 hr?

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Introductory Statistics: A Problem-Solving Approach

Edition: 3^rd

Author: Kokoska

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Thanks for your help!!

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this is exactly what I needed

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