The Composting Council of Canada requires that type AA compost must comprise less than 1% foreign matter.

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The Composting Council of Canada requires that type AA compost must comprise less than 1% foreign matter. A ministry inspector uses random sampling to test two commercial composting facilities against the standards. Of 50 samples collected at Facility A, 15 had less than half of the allowable level of foreign matter. Facility B attained this quality in 7 of 55 samples. Test the claim that Facility A has a greater proportion of product containing less than half of the allowable level of foreign matter than Facility B. Use the 0.05 significance level. If the claim is true, does it follow that Facility A consistently produces better quality compost?
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Elementary Statistics

ISBN: 9780321225979

3rd Canadian Edition

Authors: Mario F. Triola

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