Supplementary exercise 6.111 of IPS7e
-------------------------------------

In order to obtain a simultaneous error level for all tests of 5%, the
Bonferroni method uses individual error levels for each test of 5% / 10 = 0.5%.
All the listed P-values but 0.001, 0.002, and 0.004, and 0.001 exceed this value, 
therefore only the null hypotheses for these three tests should be rejected
(at an overall significance level of at most 5%).