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Mathematics, 07.04.2020 19:53, cuzhernamesari
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation .75. a. Compute a 95% CI (Confidence interval)for the true average porosity of a certain seam if the average porosity for 20 specimens from the seam was 4.85. b. Compute a 98% CI for true average porosity of another seam based on 16 specimens with a sample averageporosity of 4.56. c. How large a sample size is necessary if the width of the 95% interval is to be .40? d. What sample size is necessary to estimate true average porosity to within .2with 99% confidence?
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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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