Use Table 4 of the Appendix to find tc for a 0.90 confidence level when the sample size is 22.

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Critical Values for Student's t Distribution TABLE 4 one-tail area 0.250 0.125 0.100 0.075 0.050 0.025 0.010 0.005 0.0005 two-tail area 0.500 0,250 0.200 0.150 0.100 0050 0,020 0.010 0.0010 df c 0.500 0.750 0.800 0850 0.900 0.950 0.980 0.990 0999 1.000 2414 3.078 4.165 6.314 12.706 31821 63.657 636.619 0.816 604 1.886 2282 2920 4.303 6.965 9925 31599 0.765 1.423 138 1924 2.353 3.182 4541 5.84 2924 0.741 1344 1.533.778 2.132 2776 3,747 4604 8.610 0.727 1.30 .476 1699 2.015 2.571 3.365 4.032 6.869 0718 1273 1.440 1.650 1.943 2.447 3.143 3.707 5.959 0711 1254 1415 1617 1.895 2.365 2.998 3.499 5408 0.706 1.240 1397 1592 1860 2.306 2.896 3355 5.041 0.703 1230 1383 1.574 1833 2.262 2821 3250 4.781 0.700 1221 1372 1559 1.812 2.228 2.764 3.169 4587 0.697 1.214 1363 1.548 1.796 2.20 2.718 3.1064.437 0.695 1.209 1356 1538 1.782 2179 2.681 3.055 4318 0.694 1204 1350 1530 7 .160 2.650 3012 4.221 0.692 1.200 1345 1523 .7 2.145 2.624 2.977 4.140 0.691 1.197 341 1.517 1.753 2.1 2.602 2947 4.0T3 0.690 .194 1337 1.512 7462.120 2.583 2.921 4.015 0.689 191 1333 1508 1.7402.110 2.567 2.898 3.965 0.68B 1189 1330 1.5041734 2.101 2.552 2.878 3922 0.688 L18T 1328 1500 1.729 2.093 2.539 286 3883 0.687 1185 1.325 41,25 2086 2528 2.845 3850 0.686 1183 1323 1494 172 2080 2518 2.831 3819 0.686 1.182 1321 1492 717 2074 2.50B 2.819 3.792 0.685 .180 1.319 1489 1.714 2069 2.500 2.807 3.768 0.685 1.179 1.318 1487 1.711 2064 2.492 2.797 3.745 0.684 1.198 316 1485 708 2.060 2.485 2.787 3.725 0.684 1177 1315 1.483 1.706 2.056 2.479 2.779 3.707 0.684 L176 1314 1482 1.703 2.052 2413 2.771 3.690 0.683 L175 1313 1480 1.701 2048 2467 2.763 374 0.683 1.174 1311 1479.699 2045 2462 2.756 3.659 0.683 1.173 1310 1.477 1.697 2.042 2457 2750 .646 0.682 1.170 1 306 1.472 1.690 2.030 2.43B 2.724 3.591 0.6B .167 1303 1468 1.684 2.021 2423 2.704 3.551 0.680 1165 1301 1465 1.679 2.014 2412 2.690 3.520 0.679 1164 1299 1462 1.676 2.009 2.403 2.678 3496 0.679 1162 1296 1458 1. 2000 2.390 2.660 3460 0.67B 160 1294 1456 667 1.994 23 2.648 3435 0.678 L159 1292 1.453 1664 1.990 2374 2.639 3.416 0.G7 1.157 1290 145 1660 1984 2.364 2.626 3390 0.575 1152 1283 1442 1648 1.965 2334 2.586 3310 0.675 1.151 1282 144 646 1962 2.330 2.58 3.300 7 12 13 14 15 16 18 19 20 21 23 24 25 26 29 30 35 40 45 50 60 100 500 1000 0.674 1.150 1.282 1.440 1.645 1.960 2.326 2.576 3291