Consider a x-curve with df = 18. Obtain the x-value that has area 0.975 to its left. Click the icon to view a x-table. The x-value is (Round to three decimal places as needed.) 2 df X.995 X.99 X0.975 X0.95 X0.90 Xa.10 X0.05 1234 56989 0.000 0.000 0.001 0.004 0.016 2.706 3.841 0.010 0.020 0.051 0.103 0.211 4.605 5.991 0.072 0.115 0.216 0.352 0.584 6.251 7.815 0.207 0.297 0.484 0.711 1.064 7.779 9.488 0.412 0.554 0.831 1.145 1.610 9.236 11.070 0.676 0.872 1.237 1.635 2.204 10.645 12.592 7 0.989 1.239 1.690 2.167 2.833 12.017 14.067 1.344 1.646 2.180 2.733 3.490 13.362 15.507 1.735 2.088 2.700 3.325 4.168 14.684 16.919 10 2.156 2.558 3.247 3.940 4.865 15.987 18.307 11 2.603 3.053 3.816 4.575 5.578 17.275 19.675 12 3.074 3.571 4.404 5.226 6.304 18.549 21.026 13 3.565 4.107 5.009 5.892 7.042 19.812 22.362 14 4.075 4.660 5.629 6.571 7.790 21.064 23.685 15 4.601 5.229 6.262 7.261 8.547 22.307 24.996 18 19 6769 16 5.142 5.812 6.908 7.962 9.312 23.542 26.296 17 5.697 6.408 7.564 8.672 10.085 24.769 27.587 6.265 7.015 8.231 9.390 10.865 25.989 28.869 6.844 7.633 8.907 10.117 11.651 27.204 30.143 100 2222222222 29882 228 20 7.434 8.260 9.591 10.851 12.443 28.412 31.410 8.034 8.897 10.283 11.591 13.240 29.615 32.671 8.643 9.542 10.982 12.338 14.041 30.813 33.924 9.260 10.196 11.689 13.091 14.848 32.007 35.172 9.886 10.856 12.401 13.848 15.659 33.196 36.415 25 10.520 11.524 13.120 14.611 16.473 34.382 37.653 26 11.160 12.198 13.844 15.379 17.292 35.563 38.885 27 11.808 12.879 14.573 16.151 18.114 36.741 40.113 12.461 13.565 15.308 16.928 18.939 37.916 41.337 13.121 14.256 16.047 17.708 19.768 39.087 42.557 13.787 14.953 16.791 18.493 20.599 40.256 43.773 20.707 22.164 24.433 26.509 29.051 51.805 55.759 27.991 29.707 32.357 34.764 37.689 63.167 67.505 60 35.534 37.485 40.482 43.188 46.459 74.397 79.082 70 43.275 45.442 48.758 51.739 55.329 85.527 90.531 80 51.172 53.540 57.153 60.391 64.278 96.578 101.879 1 59.196 61.754 65.647 69.126 73.291 07.565 113.145 1 67.328 70.065 74.222 77.930 82.358 18.499 124.343 1 df X.995 X6.99 X.975 X0.95 2 X0.90 X.10 X0.05 X0.90 X.10 X.05 X0.025 2 X6.01 X0.005 df 0.016 2.706 3.841 5.024 6.635 7.879 1 O.211 4.605 5.991 7.378 9.210 10.597 0.584 6.251 7.815 9.348 11.345 12.838 23 1.064 7.779 9.488 11.143 13.277 14.860 4 1.610 9.236 11.070 12.833 15.086 16.750 5 2.204 10.645 12.592 14.449 16.812 18.548 6 2.833 12.017 14.067 16.013 18.475 20.278 7 8.490 13.362 15.507 17.535 20.090 21.955 4.168 14.684 16.919 19.023 21.666 23.589 68 4.865 15.987 18.307 20.483 23.209 25.188 10 5.578 17.275 19.675 21.920 24.725 26.757 11 5.304 18.549 21.026 23.337 26.217 28.300 12 7.042 19.812 22.362 24.736 27.688 29.819 13 7.790 21.064 23.685 26.119 29.141 31.319 14 8.547 22.307 24.996 27.488 30.578 32.801 15 9.312 23.542 26.296 28.845 32.000 34.267 16 0.085 24.769 27.587 30.191 33.409 35.718 17 0.865 25.989 28.869 31.526 34.805 37.156 18 10.003 24.107 21.301 JU.171 JJ.409 30.110 17 10.865 25.989 28.869 31.526 34.805 37.156 11.651 27.204 30.143 32.852 36.191 38.582 12.443 28.412 31.410 34.170 37.566 39.997 13.240 29.615 32.671 35.479 38.932 41.401 14.041 30.813 33.924 36.781 40.290 42.796 14.848 32.007 35.172 38.076 41.638 44.181 15.659 33.196 36.415 39.364 42.980 45.559 16.473 34.382 37.653 40.647 44.314 46.928 17.292 35.563 38.885 41.923 45.642 48.290 18.114 36.741 40.113 43.195 46.963 49.645 18.939 37.916 41.337 44.461 48.278 50.994 19.768 39.087 42.557 45.722 49.588 52.336 20.599 40.256 43.773 46.979 50.892 53.672 29.051 51.805 55.759 59.342 63.691 66.767 37.689 63.167 67.505 71.420 76.154 79.490 46.459 74.397 79.082 83.298 88.381 91.955 55.329 85.527 90.531 95.023 100.424 104.213 64.278 96.578 101.879 106.628 112.328 116.320 73.291 07.565 113.145 118.135 124.115 128.296 82.358 18.499 124.343 129.563 135.811 140.177 100 2222222 22222 222 228 18 25 26 27 28 30 40 50 60 80 90 df