Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 98%
confidence interval estimate of the population standard deviation.
60 62 62 56 62 55 59 58 59 70 61 68
The confidence interval estimate is ________mi/h
(Round to one decimal place as needed)
Area to the Right of the Critical Value 2 Degrees of Freedom ).995 0.99 0.975 0.95 0.9 0.1 0.05 0.025 0.01 0.005 Degrees of Freedom 0.001 0.004 0.016 2.706 3.841 5.024 5.635 7.879 A W 0.01 0.02 .051 0.103 0.211 1.605 5.99 7.378 9.2 10.597 0.072 0.115 0.216 0.352 .584 5.251 7.815 9.348 11.345 12.838 0.207 0.297 0.484 0.711 1.064 7.779 9.488 11.143 13.277 14.86 0.412 0.554 0.831 1.145 1.61 9.236 11.071 12.833 15.086 16.75 0.676 0.872 1.237 1.635 2.204 10.645 12.592 14.449 16.812 18.548 LD CO 0.989 1.239 1.69 2.167 2.83 12.017 14.067 16.01 18.475 20.278 10 1.344 1.646 2.18 2.733 3.49 13.362 15.507 17.535 20.09 21.955 LD CO 11 1.735 2.088 2.7 3.325 4.168 14.684 16.919 19.023 21.666 23.589 12 2.156 2.558 3.247 3.94 1.865 15.987 18.307 20.483 23.209 25.188 10 13 2.603 3.053 3.816 4.575 5.578 17.275 19.675 21.92 24.725 26.757 11 3.074 3.571 4.404 5.226 6.304 18.549 21.026 23.337 26.217 28.299 12 14 15 3.565 4.10 5.009 5.892 7.042 19.812 22.362 24.736 27.688 29.819 13 16 4.075 4.66 5.629 6.571 7.79 21.064 23.68 26.119 29.141 31.319 14 17 4.601 5.229 6.262 7.261 8.547 22.307 24.996 27.488 30.578 32.801 15 18 5.142 5.812 6.908 7.962 9.312 23.542 26.29 28.845 32 34.267 16 19 5.697 5.408 7.564 8.672 10.085 24.769 27.587 30.191 33.409 35.718 17 20 6.265 7.015 8.231 9.39 10.865 25.989 28.869 31.526 34.805 37.156 18 21 5.844 7.633 8.907 10.117 11.651 27.204 30.144 32.852 36.191 38.582 19 22 7.434 8.26 9.591 10.851 12.443 28.412 31.4 4.17 37.566 39.997 23 8.034 3.897 10.283 11.591 13.24 29.615 32.671 35.479 38.932 41.401 24 8.643 9.542 10.982 12.338 14.042 30.813 33.924 36.781 40.289 42.796 25 9.26 10.196 11.689 13.091 14.848 32.007 35.172 38.076 41.638 44.181 26 3.886 10.856 12.401 13.848 15.659 33.196 36.415 39.364 42.98 15.559 27 10.52 11.524 13.12 14.611 16.473 34.382 37.652 40.646 44.314 46.928 28 11.16 12.198 13.844 15.379 17.292 35.563 38.885 41.923 45.642 48.29 11.808 12.879 14.573 16.151 18.114 36.741 40.113 43.194 46.963 49.645 30 12.461 13.565 15.308 16.928 18.939 37.916 41.337 44.461 48.278 50.993 31 13.121 14.257 16.047 17.708 19.768 89.087 42.557 45.722 49.588 52.336 32 13.787 14.954 16.791 18.493 20.599 40.256 43.77 16.979 50.892 53.672 33 20.707 22.164 24.433 26.509 29.051 51.805 55.758 59.342 63.691 56.766 40 71.42 76.154 79.49 50 34 27.991 29.707 32.357 34.764 37.689 53.167 67.505 35 35.534 37.485 40.482 43.188 46.459 74.397 79.082 83.298 88.379 91.952 36 43.275 45.442 48.758 51.739 55.329 85.527 90.531 95.023 100.425 104.215 8 8 8 8 37 51.172 53.54 57.153 60.391 64.278 96.578 101.879 106.629 112.329 116.321 38 59.196 51.754 65.647 69.126 73.291 107.565 113.145 118.136 124.116 128.29939 100 67.328 70.065 74.222 77.929 82.358 118.498 124.342 129.561 135.807 140.169 100 40 0.995 0.99 0.975 0.95 0.9 0.1 0.05 0.025 0.01 0.005 41 Area to the Right of the Critical Value 42 Degrees of Freedom 43 n-1 Confidence interval or hypothesis test for a standard deviation sigma or variance sigma superscript 2 44 k-1 Goodness-of-fit with k categories 45 (r-1) (c-1) Contingency table with r rows and c columns 46 k-1 Kruskal-Wallis test with k samples 47 48
