Assume that a simple random sample has been selected and test the given claim. Listed below are the lead concentrations in μg/g measured in different traditional medicines. Use a 0.01 significance level to test the claim that the mean lead concentration for all such medicines is less than 13 μg/g.   3.0      6.5      5.5      5.0      20.0      7.5      11.5      20.0      12.0      17.5      Find test statistic and P-value

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