Suppose that the average time spent per day with digital media several years ago was 3 hours and 19 minutes. For last?year, a random sample of 20 adults in a certain region spent the numbers of hours per day with digital media given in the accompanying table. Preliminary data analyses indicate that the?t-interval procedure can reasonably be applied. Find and interpret a 99?% confidence interval for last?year's mean time spent per day with digital media by adults of the region.?(Note: x=4.74 hr and s=2.23 ?hr.)
The 99?% confidence interval is from Hours -------?to Hours--------?
i Digital Media Times X 1.3 4.6 5.4 3.6 5.4 1.9 5.9 1.6 7.5 9.0 6.7 5.2 8.7 4.3 2.3 2.4 4.6 4.3 3.7 6.4 Print DoneValues of to df Co.10 df 3.078 5.314 12.706 31.821 63.657 1.886 2.920 4.30 6.965 9.925 1.638 2.353 3.182 AWN AWN 4.541 5.841 1.533 2.132 2.776 3.747 4.604 1.476 2.015 2.571 3.365 4.032 1-Table (Page 1) 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 1.383 1.833 2.262 2.821 3.250 1.301 1.680 2.015 2.414 2.692 44 10 1.372 1.812 2.228 2.764 3.169 10 1.301 1.679 2.014 2.412 2.690 45 11 1.363 1.796 2.201 2.718 3.106 11 1.300 1.679 2.013 2.410 2.687 46 12 1.356 1.782 2.179 2.681 3.055 12 1.300 1.678 2.012 2.408 2.685 47 48 13 1.350 1.771 2.160 2.650 3.012 13 1.299 1.677 2.011 2.407 2.682 14 2.624 2.977 14 1.299 1.677 2.010 2.405 2.680 40 1.345 1.761 2.145 15 1.341 1.753 2.131 2.602 2.947 15 df To.01 df 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 1.325 1.725 2.086 2.528 2.845 1.323 1.721 2.080 2.518 2.831 1.321 1.717 2.074 2.508 2.819 1.319 1.714 2.069 2.500 2.807 1.318 1.711 2.064 2.492 2.797 1.316 1.708 2.060 2.485 2.787 1.315 1.706 2.056 2.479 2.779 1.314 1.703 2.052 2.473 2.771 1.313 1.701 2.048 2.467 2.763 1.311 1.699 2.045 2.462 2.756 1.310 1.697 2.042 2.457 2.750 30 1.309 1.696 2.040 2.453 2.744 31 1.309 1.694 2.037 2.449 2.738 32 1.308 1.692 2.035 2.445 2.733 33 1.307 1.691 2.032 2.441 2.728 34 1.306 1.690 2.030 2.438 2.724 35 1.306 1.688 2.028 2.434 2.719 36 1.305 1.687 2.026 2.431 2.715 37 1.304 1.686 2.024 2.429 2.712 38 1.304 1.685 2.023 2.426 2.708 39 1.303 1.684 2.021 2.423 2.704 40 1.303 1.683 2.020 2.421 2.701 41 1.302 1.682 2.018 2.418 2.698 1.302 1.681 2.017 2.416 2.6957/5/2021 1-Table (Page 2) Values of to if Co, 10 Fo.ns 0.015 df 50 1.299 1.676 2.009 2.403 2.678 51 1.298 1.675 2.008 2.402 2.676 52 1.298 1.675 2.007 2.400 2.674 1.282 1.645 1.960 2.326 2.576 53 1.298 1.674 2.006 2.399 2.672 Zo.10 Zans 20,025 54 1.297 1.674 2.005 2.397 2.670 55 1.297 1.673 2.004 2.396 2.668 56 1.297 1.673 2.003 2.395 2.667 57 1.297 1.672 2.002 2.394 2.665 58 1.296 1.672 2.002 2.392 2.663 59 1.296 1.671 2.001 2.391 2.662 60 1.296 1.671 2.000 2.390 2.660 61 1.296 1.670 2.000 2.389 2.659 62 1.295 1.670 1.999 2.388 2.657 4 NUNN8 8898 20898 68486 KENME 63 1.295 1.669 1.998 2.387 2.656 64 1.295 1.669 1.998 2.386 2.655 65 1.295 1.669 1.997 2.385 2.654 66 1.295 1.668 1.997 2.384 2.652 67 1.294 1.668 1.996 2.383 2.651 68 1.294 1.668 1.995 2.382 2.650 69 1.294 1.667 1.995 2.382 2.649 70 1.294 1.667 1.994 2.381 2.648 71 1.294 1.667 1.994 2.380 2.647 72 1.293 1.666 1.993 2.379 2.646 73 1.293 1.666 1.993 2.379 2.645 74 1.293 1.666 1.993 2.378 2.644 75 1.293 1.665 1.992 2.377 2.643 80 1.292 1.664 1.990 2.374 2.639 85 1.292 1.663 1.988 2.371 2.635 90 1.291 1.662 1.987 2.368 2.632 95 1.291 1.661 1.985 2.366 2.629 100 1.290 1.660 1.984 2.364 2.626 100 200 1.286 1.653 1.972 2.345 2.601 200 300 1.284 1.650 1.968 2.339 2.592 300 400 1.284 1.649 1.966 2.336 2.588 400 500 1.283 1.648 1.965 2.334 2.586 500 600 1.283 1.647 1.964 2.333 2.584 600 700 1.283 1.647 1.963 2.332 2.583 700 800 1.283 1.647 1.963 2.331 2.582 800 900 1.282 1.647 1.963 2.330 2.581 900 1000 1.282 1.646 1.962 2.330 2.581 1000 2000 1.282 1.646 1.961 2.328 2.578 2000 df df To.10
