Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.71. (d) What sample size is necessary to estimate true average porosity to within 0.19 with 99% confidence? (Round your answer up to the nearest whole number.) specimens
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.71. (d) What sample size is necessary to estimate true average porosity to within 0.19 with 99% confidence? (Round your answer up to the nearest whole number.) specimens
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 31PPS
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![Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.71.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F63a2672e-f44e-49ad-ac63-45b39b5df3ef%2Fc4efd6ad-b126-439e-9d5c-0dd1fe2f4c31%2F6k9r4wd_processed.png&w=3840&q=75)
Transcribed Image Text:Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.71.
![(d) What sample size is necessary to estimate true average porosity to within 0.19 with 99% confidence? (Round your answer up to the nearest whole number.)
specimens](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F63a2672e-f44e-49ad-ac63-45b39b5df3ef%2Fc4efd6ad-b126-439e-9d5c-0dd1fe2f4c31%2Fxpslxds_processed.png&w=3840&q=75)
Transcribed Image Text:(d) What sample size is necessary to estimate true average porosity to within 0.19 with 99% confidence? (Round your answer up to the nearest whole number.)
specimens
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