Question
1. The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.
1. The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 1.21.2 gallons. The mean water usage per family was found to be 16.516.5 gallons per day for a sample of 10751075 families. Construct the 99%99% confidence interval for the mean usage of water. Round your answers to one decimal place. what is the lower endpoint and the upper endpoint
2. . Consider the value of t such that 0.050.05 of the area under the curve is to the right of t.
Assuming the degrees of freedom equals 2020, select the t value from the t table.
To select a value from the table either click the cell at the intersection of the row and column or use the arrow keys to find the appropriate cell in the table and select it using the Space key. To change the sign of the selected value, use the +/- button.
t-value +/
0.1 | 0.05 | 0.025 | 0.01 | 0.005 | |
---|---|---|---|---|---|
1 | 3.078 | 6.314 | 12.706 | 31.821 | 63.657 |
2 | 1.886 | 2.920 | 4.303 | 6.965 | 9.925 |
3 | 1.638 | 2.353 | 3.182 | 4.541 | 5.841 |
4 | 1.533 | 2.132 | 2.776 | 3.747 | 4.604 |
5 | 1.476 | 2.015 | 2.571 | 3.365 | 4.032 |
6 | 1.440 | 1.943 | 2.447 | 3.143 | 3.707 |
7 | 1.415 | 1.895 | 2.365 | 2.998 | 3.499 |
8 | 1.397 | 1.860 | 2.306 | 2.896 | 3.355 |
9 | 1.383 | 1.833 | 2.262 | 2.821 | 3.250 |
10 | 1.372 | 1.812 | 2.228 | 2.764 | 3.169 |
11 | 1.363 | 1.796 | 2.201 | 2.718 | 3.106 |
12 | 1.356 | 1.782 | 2.179 | 2.681 | 3.055 |
13 | 1.350 | 1.771 | 2.160 | 2.650 | 3.012 |
14 | 1.345 | 1.761 | 2.145 | 2.624 | 2.977 |
15 | 1.341 | 1.753 | 2.131 | 2.602 | 2.947 |
16 | 1.337 | 1.746 | 2.120 | 2.583 | 2.921 |
17 | 1.333 | 1.740 | 2.110 | 2.567 | 2.898 |
18 | 1.330 | 1.734 | 2.101 | 2.552 | 2.878 |
19 | 1.328 | 1.729 | 2.093 | 2.539 | 2.861 |
20 | 1.325 | 1.725 | 2.086 | 2.528 | 2.845 |
21 | 1.323 | 1.721 | 2.080 | 2.518 | 2.831 |
22 | 1.321 | 1.717 | 2.074 | 2.508 | 2.819 |
23 | 1.319 | 1.714 | 2.069 | 2.500 | 2.807 |
24 | 1.318 | 1.711 | 2.064 | 2.492 | 2.797 |
25 | 1.316 | 1.708 | 2.060 | 2.485 | 2.787 |
26 | 1.315 | 1.706 | 2.056 | 2.479 | 2.779 |
27 | 1.314 | 1.703 | 2.052 | 2.473 | 2.771 |
28 | 1.313 | 1.701 | 2.048 | 2.467 | 2.763 |
29 | 1.311 | 1.699 | 2.045 | 2.462 | 2.756 |
30 | 1.310 | 1.697 | 2.042 | 2.457 | 2.750 |
31 | 1.309 | 1.696 | 2.040 | 2.453 | 2.744 |
32 | 1.309 | 1.694 | 2.037 | 2.449 | 2.738 |
34 | 1.307 | 1.691 | 2.032 | 2.441 | 2.728 |
36 | 1.306 | 1.688 | 2.028 | 2.434 | 2.719 |
38 | 1.304 | 1.686 | 2.024 | 2.429 | 2.712 |
40 | 1.303 | 1.684 | 2.021 | 2.423 | 2.704 |
45 | 1.301 | 1.679 | 2.014 | 2.412 | 2.690 |
50 | 1.299 | 1.676 | 2.009 | 2.403 | 2.678 |
55 | 1.297 | 1.673 | 2.004 | 2.396 | 2.668 |
60 | 1.296 | 1.671 | 2.000 | 2.390 | 2.660 |
65 | 1.295 | 1.669 | 1.997 | 2.385 | 2.654 |
70 | 1.294 | 1.667 | 1.994 | 2.381 | 2.648 |
75 | 1.293 | 1.665 | 1.992 | 2.377 | 2.643 |
80 | 1.292 | 1.664 | 1.990 | 2.374 | 2.639 |
90 | 1.291 | 1.662 | 1.987 | 2.368 | 2.632 |
100 | 1.290 | 1.660 | 1.984 | 2.364 | 2.626 |
120 | 1.289 | 1.658 | 1.980 | 2.358 | 2.617 |
200 | 1.286 | 1.653 | 1.972 | 2.345 | 2.601 |
300 | 1.284 | 1.650 | 1.968 | 2.339 | 2.592 |
400 | 1.284 | 1.649 | 1.966 | 2.336 | 2.588 |
500 | 1.283 | 1.648 | 1.965 | 2.334 | 2.586 |
750 | 1.283 | 1.647 | 1.963 | 2.331 | 2.582 |
1000 | 1.282 | 1.646 | 1.962 | 2.330 | 2.581 |
2000 | 1.282 | 1.646 | 1.961 | 2.328 | 2.578 |
1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
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