Listed below are the lead concentrations in
μ g/g measured in different traditional medicines. Use a 0.05
significance level to test the claim that the mean lead concentration for all such medicines is less than
15 μ g/g. Assume that the lead concentrations in traditional medicines are normally distributed.
6.5 9 10.5 14.5 20.5 16 6.5 4.5 22 16.5
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