4. A soft drink company claims that their cans contain 12 oz of
soda. You believe that they are under-filling their containers. A
random sample of 16 cans gives an average of 11.8 oz. Given that
the population standard deviation of soda cans is .4 oz, does this
test result provide significant evidence that the company is
under-filling? State the appropriate hypothesis, find the P-value,
and determine whether this evidence is significant, at the
significance level of 5%.
Show your work (like calculations) not just an answer to receive
a full credit.