Question

Listed below are the lead concentrations in mu​g/g measured in different traditional medicines. Use a 0.01 significance level to test the claim that the mean lead concentration for all such medicines is less than 16 mu​g/g.

21.5     16.5     3     14.5     4.5     2.5     20.5     16.5     10     13.5

Answer 1

From given data first we find

sample mean is Xˉ=12.3 and the sample standard deviation is s = 7.01

and the sample size is n = 10

(5) Conclusion

It is concluded that the null hypothesis Ho is not rejected. Therefore, there is not enough evidence to claim that the population mean μ is less than 16, at the 0.01 significance level.

Done