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Listed below are the lead concentrations in mu​g/g measured in different traditional medicines. Use a 0.10...

Listed below are the lead concentrations in mu​g/g measured in different traditional medicines. Use a 0.10 significance level to test the claim that the mean lead concentration for all such medicines is less than 20 mu​g/g. 21.5     9     19.5     22     8.5     20     19.5     11     18     20

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as test statistic is in rejection region; we reject null hypothesis

We have sufficient evidence to conclude that mean lead concentration for all such medicines is less than 20

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