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Listed below are the lead concentrations in mu μ​g/g measured in different traditional medicines. Use a...

Listed below are the lead concentrations in mu 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 19 mu μ​g/g. Assume that the lead concentrations in traditional medicines are normally distributed. 12 14 21 21.5 13.5 21.5 9 16 21.5 5.5

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