Use critical value to evaluate the
null hypothesis
Choo Choo Paper Company makes
various paper products. One of their products is a 30 mils thick paper. In
order to ensure that the thickness of the paper meets the 30 mils
specification, random cuts of paper are selected and the thickness of each cut
is measured. A sample of 64 cuts had a mean thickness of 30.3 mils with a
standard deviation of 4 mils.
a. F at alpha=0.05, using the
critical value approach test to see if the mean thickness is significantly more
than 30 mils (state the null and alternative hypothesis).





