Mathematics, 25.07.2019 16:00 lolz55678
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.75. (a) compute a 95% ci for the true average porosity of a certain seam if the average porosity for 25 specimens from the seam was 4.85. (round your answers to two decimal places.) , (b) compute a 98% ci for 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.) , (c) how large a sample size is necessary if the width
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Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is no...
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