Listed below are lead concentrations in uh/g measured in different traditional medicines. Use a 0.5 significance level to test the claim that the mean lead concentration for all such medicines is less than 15 ug/g. Assume a random sample is a simple random sample: 22.5,20,13.5,11,3.5,10,2.5,15,17,15

determine test statistic

(two decimal place)

p-value

(three decimal place)