=+background value for this concentration was 20. The results of various statistical tests described in the article
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=+background value for this concentration was 20. The results of various statistical tests described in the article were predicated on assuming normality.
Does the data provide strong evidence for concluding that the true average concentration in the sampled region exceeds the stated background value? Carry out a test at significance level .01.
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Related Book For 
Applied Statistics For Engineers And Scientists
ISBN: 9781133111368
3rd Edition
Authors: Jay L. Devore, Nicholas R. Farnum, Jimmy A. Doi
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