- 2 Assume That The Helium Porosity In Percentage Of Coal Samples Taken From Any Particular Seam Is Normally Distribute 1 (154 KiB) Viewed 45 times
2. Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distribute
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2. Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distribute
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?
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