What are you drinking?Environmental Protection Agency standards require that the amount of lead in drinking water be less than15

micrograms per liter. Eleven samples of water from a particular source have the following concentrations, in units of micrograms per liter. Assume the population standard deviation is

=3

. If appropriate, perform a hypothesis test to determine whether you can conclude that the mean concentration of lead meets the EPA standards. Use the

=0.05

level of significance and theP

-value method with the table.

14.9, 12 , 14.9 , 16.9 , 8.8 , 12.8 , 8.9 ,13 ,17.8 , 9.9 , 16.3

State the appropriate null and alternate hypotheses.

H0=

H1=

Is it left,right,two tailed?