Assume that the helium porosity (in percentage) of
Chapter 7, Problem 5(choose chapter or problem)
Assume that the helium porosity (in percentage) of coalsamples taken from any particular seam is normally distributedwith true standard deviation .75.a. Compute a 95% CI for the true average porosity of acertain seam if the average porosity for 20 specimensfrom the seam was 4.85.b. Compute a 98% CI for true average porosity ofanother seam based on 16 specimens with a sampleaverage porosity of 4.56.c. How large a sample size is necessary if the width ofthe 95% interval is to be .40?d. What sample size is necessary to estimate true averageporosity to within .2 with 99% confidence?
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