c. How large a sample size is necessary if the width ofthe 95% interval is to be 40?d. What sample size is necessary to estimate true aver-age porosity to within .2 with 99% confidence? 5. Assume that the helium porosity (in percentage) of coalsamples taken from any particular seam is nomally dis-tributed with true standard deviation .75.

Given Information: The helium porosity is normally distributed with standard deviation of 0.75…

Answered: a. How large a sample size is necessary…

a. How large a sample size is necessary if the width of the 95% interval is to be 40? d. What sample size is necessary to estimate true aver- age porosity to within 2 with 99% confidence?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section: Chapter Questions

Problem 22SGR

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Estimation

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Question

c. How large a sample size is necessary if the width of
the 95% interval is to be 40?
d. What sample size is necessary to estimate true aver-
age porosity to within .2 with 99% confidence?

5. Assume that the helium porosity (in percentage) of coal
samples taken from any particular seam is nomally dis-
tributed with true standard deviation .75.

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