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2. Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distribute
Posted: Mon May 09, 2022 12:46 pm
by answerhappygod
- 2 Assume That The Helium Porosity In Percentage Of Coal Samples Taken From Any Particular Seam Is Normally Distribute 1 (154 KiB) Viewed 46 times
2. Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with a true standard deviation 0.75. a. (5 points) Compute a 95% CI for the true average porosity of a certain seam if the average porosity for 20 specimens from the seam is 4.85. b. (5 points) Compute a 98% CI for true average porosity of another seam based on 16 specimens with a sample average porosity of 4.56. c. (5 points) How large a sample size is necessary if the width of the 95% interval is to be 0.40?