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A population has a mean u = 133 and a standard deviation o = 21. Find the mean and standard deviation of the sampling distribution of sample means with sample size n = 40. The mean is u- = , and the standard deviation is or = (Round to three decimal places as needed.)t-Distribution Table Find the margin of error for the given values of c, s, and n. C = 0.80, s = 3.8, n = 8 Level of Click the icon to view the t-distribution table. confidence, c 0.80 0.90 0.95 0.98 0.99 One tail, or 0.10 0.05 0.025 0.01 0.005 d.f. Two tails, c 0.20 0.10 0.05 0.02 0.01 d.f. The margin of error is . (Round to one decimal place as needed.) 3.078 6.314 12.706 31.821 63.657 1.886 2.920 4.303 6.965 9.925 N IAWN 1.638 2.353 3.182 4.541 5.841 W 1.533 2.132 2.776 3.747 4.604 5 1.476 2.015 2.571 3.365 4.032 1.440 1.943 2.447 3.143 3.707 1.415 1.895 2.365 2.998 3.499 1.397 1.860 2.306 2.896 3.355 CO 1.383 1.833 2.262 2.821 3.250 1.372 1.812 2.228 2.764 3.169 10 1.363 1.796 2.201 2.718 3.106 11 1.356 1.782 2.179 2.681 3.055 12 1.350 1.771 2.160 2.650 3.012 13 14 1.345 1.761 2.145 2.624 2.977 14 15 1.341 1.753 2.131 2.602 2.947 15 16 1.337 1.746 2.120 2.583 2.921 16 17 1.333 1.740 2.110 2.567 2.898 17 18 1.330 1.734 2.101 2.552 2.878 18 19 1.328 1.729 2.093 2.539 2.861 19 20 1.325 1.725 2.086 2.528 2.845 20 21 1.323 1.721 2.080 2.518 2.831 2121 1.323 1.721 2.080 2.518 2.831 21 22 1.321 1.717 2.074 2.508 2.819 22 23 1.319 1.714 2.069 2.500 2.807 23 24 1.318 1.711 2.064 2.492 2.797 24 25 1.316 1.708 2.060 2.485 2.787 25 26 1.315 1.706 2.056 2.479 2.779 26 27 1.314 1.703 2.052 2.473 2.771 27 28 1.313 1.701 2.048 2.467 2.763 28 29 1.311 1.699 2.045 2.462 2.756 29 30 1.310 1.697 2.042 2.457 2.750 30 31 1.309 1.696 2.040 2.453 2.744 31 32 1.309 1.694 2.037 2.449 2.738 32 33 1.308 1.692 2.035 2.445 2.733 33 34 1.307 1.691 2.032 2.441 2.728 34 35 1.306 1.690 2.030 2.438 2.724 35 36 1.306 1.688 2.028 2.434 2.719 36 37 1.305 1.687 2.026 2.431 2.715 37 38 1.304 1.686 2.024 2.429 2.712 38 39 1.304 1.685 2.023 2.426 2.708 39 40 1.303 1.684 2.021 2.423 2.704 40 45 1.301 1.679 2.014 2.412 2.690 45 50 1.299 1.676 2.009 2.403 2.678 50 60 1.296 1.671 2.000 2.390 2.660 60 70 1.294 1.667 1.994 2.381 2.648 70 80 1.292 1.664 1.990 2.374 2.639 8030 1.310 1.697 2.042 2.45/ 2.750 31 1.309 1.696 2.040 2.453 2.744 31 32 1.309 1.694 2.037 2.449 2.738 32 33 1.308 1.692 2.035 2.445 2.733 33 34 1.307 1.691 2.032 2.441 2.728 34 35 1.306 1.690 2.030 2.438 2.724 35 36 1.306 1.688 2.028 2.434 2.719 36 37 1.305 1.687 2.026 2.431 2.715 37 38 1.304 1.686 2.024 2.429 2.712 38 39 1.304 1.685 2.023 2.426 2.708 39 40 1.303 1.684 2.021 2.423 2.704 40 45 1.301 1.679 2.014 2.412 2.690 45 50 1.299 1.676 2.009 2.403 2.678 50 60 1.296 1.671 2.000 2.390 2.660 60 70 1.294 1.667 1.994 2.381 2.648 70 80 1.292 1.664 1.990 2.374 2.639 80 90 1.291 1.662 1.987 2.368 2.632 90 100 1.290 1.660 1.984 2.364 2.626 100 500 1.283 1.648 1.965 2.334 2.586 500 1000 1.282 1.646 1.962 2.330 2.581 1000 1.282 1.645 1.960 2.326 2.576 d.f. Level of d.f. confidence, c 0.80 0.90 0.95 0.98 0.99 One tail, or 0.10 0.05 0.025 0.01 0.005 Two tails, a 0.20 0.10 0.05 0.02 0.01