Assume that a simple random sample has been selected and test the given claim. Listed below are the lead
concentrations in µg/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 15 µg/g.
3.5 6.5 6.5 5.5 19.5 7.0 12.5 20.0 10.5

Identify the value of the test statistic.
And P-value