Note: There are answers at the back of the book, but this is a new edition and there are likely to be some mistakes in these answers. So far, we know that problem 5.15c has an incorrect answer given (the correct answer is 0.20) as do 6.6 (he forgot to take the square root in his standard error calculation), 7.6 (his standard error calculation is wrong), 17.1 and 2 (his values for a and b seem to be incorrect - they should be a = 3.4714 and b = - 0.8776) and 22.6 (he has the correct conclusion but the correct critical critical value for D is D _0.05(2),30 = 0.24170).