Listed below are the lead concentrations in μ​g/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 18 μ​g/g. Assume that the sample is a simple random sample.   3.5      21      20      10.5      17      18.5      4.5      20      12.5      15.5

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