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 16 μ​g/g. Assume that the sample is a simple random sample 13 9 20.5 9.5 21.5 8 4 21 20 11.5 =< Determine the test statistic. (round to two decimal places as needed) Determine the P-value. (round to three decimal places as needed) State the final conclusion that addresses the original claim.  (fail to reject/reject) H0. There is (sufficient/not sufficient) evidence to conclude that the mean lead concentration for all such medicines is (not/greater than/equal to/less than) 16ug/g.

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.