Listed below are the lead concentrations in mu 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 mu ​g/g. Assume that the sample is a simple random sample. a. Determine the test statistic. (Round to two decimal places as​ needed.)   b. Determine the​ P-value. ​(Round to three decimal places as​ needed.)

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