An accounting firm tested two spreadsheet applications to determine whether there is a difference between them in the mean speed with which a standard accounting problem can be solved. The times needed for each of twelve accountants to solve the problem are as follows:

Can you conclude that the mean time differs between the two applications? Use the a = 0.05 level of significance.

Accountant Application 1 2 3 4 5 6 78 9 1 12 42 34 45 35 40 44 48 49 33 31 38 50 43 48 3 39 56 45 60 46 47 33 50