**Title: Understanding Helium Porosity in Coal Samples****Instructions:**Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with a true standard deviation of 0.76.1. **Compute a 95% CI for the true average porosity of a certain seam** if the average porosity for 19 specimens from the seam was 4.85. (Round your answers to two decimal places) - [ ]2. **Compute a 98% CI for the true average porosity of another seam** based on 15 specimens with a sample average porosity of 4.56. (Round your answers to two decimal places) - [ ]3. **How large a sample size is necessary if the width of the 95% interval is to be 0.30?** (Round your answer up to the nearest whole number) - [ ]4. **What sample size is necessary to estimate true average porosity to within 0.23 with 99% confidence?** (Round your answer up to the nearest whole number) - [ ]*Note: You may need to use the appropriate table in the Appendix of Tables to answer this question.*

e that the helium porosity (in percentage) of coal samples tal (a) Compute a 95% CI for the true average porosity of a ce decimal places.) (b) Compute a 98% CI for true average porosity of another decimal places.) (c) How large a sample size is necessary if the width of the specimens

e that the helium porosity (in percentage) of coal samples tal (a) Compute a 95% CI for the true average porosity of a ce decimal places.) (b) Compute a 98% CI for true average porosity of another decimal places.) (c) How large a sample size is necessary if the width of the specimens

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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