The load cell is now tested by taking 15 force readings using 5 different known masses. If the standard deviation of those 15 force readings is 0.68 N, what is the higher-order uncertainty associated with these measurements?

 

Table 4.4 Student's t Distribution V 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 30 40 50 60 150 1.000 0.816 0.765 0.741 0.727 0.718 0.711 0.706 0.703 0.700 0.697 0.695 0.694 0.692 0.691 0.690 0.689 0.688 0.688 0.687 0.686 0.683 0.681 0.680 0.679 0.674 190 6.314 2.920 2.353 2.132 2.015 1.943 1.895 1.860 1.833 1.812 1.796 1.782 1.771 1.761 1.753 1.746 1.740 1.734 1.729 1.725 1.721 1.697 1.684 1.679 1.671 1.645 195 12.706 4.303 3.182 2.770 2.571 2.447 2.365 2.306 2.262 2.228 2.201 2.179 2.160 2.145 2.131 2.120 2.110 2.101 2.093 2.086 2.080 2.042 2.021 2.010 2.000 1.960 199 63.657 9.925 5.841 4.604 4.032 3.707 3.499 3.355 3.250 3.169 3.106 3.055 3.012 2.977 2.947 2.921 2.898 2.878 2.861 2.845 2.831 2.750 2.704 2.679 2.660 2.576