Listed below are the lead concentrations in 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 g/g. Assume that the lead concentrations in traditional medicines are normally distributed.

6

7.5

9

15

3.5

7

13

12.5

21

15

Determine the test statistic. ____ (ROUND TO TWO DECIMAL PLACES AS NEEDED.)

Determine the P-value. _____ (ROUND TO THREE DECIMAL PLACES AS NEEDED.)