In 2017, Americans spent a record-high $9.1 billion on Halloween-related purchases (the balance website). Sample data sh

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In 2017 Americans Spent A Record High 9 1 Billion On Halloween Related Purchases The Balance Website Sample Data Sh 1 (26.25 KiB) Viewed 13 times

In 2017 Americans Spent A Record High 9 1 Billion On Halloween Related Purchases The Balance Website Sample Data Sh 2 (71.61 KiB) Viewed 13 times

In 2017, Americans spent a record-high $9.1 billion on Halloween-related purchases (the balance website). Sample data showing the amount, in dollars, 16 adults spent on a Halloween costume are as follows. 10 36 50 44 66 38 15 35 23 33 14 66 66 43 99 25 a. What is the estimate of the population mean amount adults spend on a Halloween costume (to 2 decimals)? $ b. What is the sample standard deviation (to 2 decimals)? $ c. Provide a 95% confidence interval estimate of the population standard deviation for the amount adults spend on a Halloween costume (to 2 decimals). Use Table 11.1. $ sos$
TABLE 11.1 Degrees of Freedom 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 40 60 80 100 Selected Values from the Chi-Square Distribution Table* .99 .000 .020 .115 .297 .554 .872 1.239 1.647 2.088 .975 5.229 5.812 6.408 .001 .051 .216 .484 2.558 3.247 3.053 3.816 3.571 4.107 5.009 4.660 5.629 .95 .004 .103 .352 .711 .831 1.145 1.610 1.237 1.635 2.204 1.690 2.167 2.833 2.180 2.733 3.490 2.700 3.325 4.168 7.015 7.633 8.907 3.940 4.575 4.404 5.226 5.892 6.571 6.262 7.261 6.908 7.962 7.564 8.672 8.231 9.390 10.117 11.524 14.611 13.120 12.198 13.844 15.379 12.878 14.573 16.151 16.928 14.256 16.047 17.708 13.565 15.308 Area in Upper Tail .90 .10 .016 2.706 .211 4.605 .584 6.251 1.064 7.779 X²² 8.547 9.312 10.085 10.865 11.651 8.260 9.591 10.851 12.443 8.897 10.283 11.591 13.240 9.542 10.982 12.338 14.041 10.196 11.689 13.091 14.848 10.856 12.401 13.848 15.659 Area or probability 16.473 17.292 18.114 4.865 5.578 6.304 7.041 19.812 7.790 21.064 9.236 11.070 12.832 15.086 14.449 16.812 10.645 12.592 12.017 14.067 16.013 18.475 13.362 15.507 17.535 20.090 14.684 16.919 19.023 21.666 .05 .025 .01 3.841 5.024 6.635 5.991 7.378 9.210 7.815 11.345 9.488 13.277 15.987 18.307 20.483 17.275 19.675 21.920 18.549 21.026 23.337 22.362 24.736 23.685 22.307 23.542 24.769 9.348 11.143 24.996 27.488 30.578 26.296 28.845 32.000 27.587 30.191 33.409 25.989 28.869 31.526 34.805 27.204 30.144 32.852 36.191 18.939 19.768 39.087 23.209 24.725 26.217 27.688 26.119 29.141 28.412 31.410 34.170 37.566 29.615 32.671 35.479 38.932 30.813 33.924 36.781 40.289 32.007 35.172 38.076 41.638 33.196 36.415 39.364 42.980 34.382 37.652 40.646 44.314 35.563 38.885 41.923 45.642 36.741 40.113 43.195 46.963 37.916 41.337 44.461 48.278 42.557 45.722 49.588 *Note: A more extensive table is provided as Table 3 of Appendix B (available online). 43.773 46.979 50.892 14.953 16.791 18.493 22.164 24.433 55.758 59.342 63.691 20.599 40.256 26.509 29.051 51.805 37.485 40.482 43.188 46.459 74.397 53.540 57.153 60.391 64.278 96.578 101.879 106.629 112.329 70.065 74.222 77.929 82.358 118.498 124.342 129.561 135.807 79.082 83.298 88.379