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  3. assume that the helium porosity (in percentage) of

Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is...

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Basic Math

Assume that the helium porosity (in percentage) of coal samplestaken from any particular seam is normally distributed with truestandard deviation 0.77.

(c) How large a sample size is necessary if the width of the 95%interval is to be 0.42? (Round your answer up to the nearest wholenumber.)

(d) What sample size is necessary to estimate true averageporosity to within 0.23 with 99% confidence? (Round your answer upto the nearest whole number.)

Answer & Explanation Solved by verified expert
3.8 Ratings (419 Votes)
solutionstandard deviation 077Margin of error E width20422021At 95    See Answer
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