gree r for acryte bone ment under the speared eendben, tuse You may need to use

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gree r for acryte bone ment under the speared eendben, tuse You may need to use the appropriate table In Appendtx A to answer this question Need Help? E.051 The Bureau of Alcohol, Tobacco, and Firearms (BATF) has been concerned about lead levels in California wines. In a previous testing of wine specimens, lead levels ranging from 55 to 690 parts per billion were recorded. How many wine specimens should be tested if the BATF wishes to estimate the true mean lead level for Califomia wines to within 10 parts per bitlon with 90% You may need to use the appropriate table in Appendix A to answer this question. Need Help? Submit Assignment Save Home My Assignments Extension Request MacBook Air F3 9 4 5 6 7 2 3

Explanation / Answer

Using range rule of thumb find the value of std. dev.

std. dev. = Range/4 = (690 - 55)/4 = 158.75

Sample size required is 682

Given CI Level 90% Margin of Error(ME) 10 std. dev. 158.75 z-value of 90% CI 1.6449 n = (z*sigma/ME)^2 682

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