Maurice Tutor

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    Argosy University/ Phoniex University/
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Category > Management Posted 20 Jan 2018 My Price 5.00

true average porosity

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 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 average porosity 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 .2 with 99% confidence?

 

Answers

Maurice Tutor
(5)
Status NEW Posted 20 Jan 2018 11:01 PM My Price 5.00

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