1. (3+1 for Excel work) Public health in a local hospital decided to test whether the length of time that nurses wash their hands will alter the amount of bacteria remaining on them. To ensure consistency in the testing nine nurses were selected and each washed their hands, in the first trial for 2.5 seconds and in the second for 15 seconds. The amount of remaining bacteria was measured in each case. Test the hypothesis that longer washing leads to less bacteria remaining. Use alpha = 0.05.