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 (32.4 KiB) Viewed 11 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. 66 38 13 31 a. What is the estimate of the population mean amount adults spend on a Halloween costume (to 2 decimals)? $41.447. b. What is the sample standard deviation (to 2 decimals)? 17.55 <o<$ 15 36 50 47 23.75 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. 36.76 23 32 13 64 63 42 95 29

TABLE 11.1 Selected Values from the Chi-Square Distribution Table* Degrees of Freedom 12345a 6 7 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 .99 .000 .020 .115 297 .975 .001 .051 .216 .484 2.558 3.247 3.053 3.816 3.571 4.404 4.107 5.009 4.660 5.629 .95 .004 .103 .352 .711 7.015 8.231 7.633 .554 .831 1.145 .872 1.237 1.635 2.204 1.239 1.690 2.167 2.833 1.647 2.180 2.733 3.490 2.088 2.700 3.325 4.168 5.229 6.262 7.261 5.812 6.908 7.962 6.408 7.564 8.672 Area in Upper Tail .90 8.907 10.117 8.260 9.591 10.851 8.897 10.283 11.591 9.542 10.982 12.338 10.196 11.689 13.091 10.856 12.401 13.848 .016 211 .584 6.251 1.064 7.779 Area or probability 3.940 4.865 15.987 18.307 4.575 5.578 17.275 19.675 5.226 6.304 5.892 7.041 6.571 7.790 9.390 10.865 11.651 8.547 9.312 10.085 .10 .05 2.706 3.841 4.605 5.991 7.815 9.488 1.610 9.236 10.645 12.017 13.362 15.507 14.684 16.919 12.443 13.240 14.041 14.848 15.659 11.524 13.120 14.611 16.473 12.198 13.844 15.379 17.292 12.878 14.573 16.151 18.114 13.565 15.308 16.928 18.939 14.256 16.047 17.708 19.768 11.070 12.832 15.086 12.592 14.449 16.812 14.067 18.475 20.090 21.666 22.307 23.542 24.769 25.989 27.204 .025 .01 5.024 6.635 7.378 9.210 9.348 11.345 11.143 13.277 16.013 17.535 19.023 18.549 21.026 23.337 19.812 22.362 21.064 23.685 26.119 20.483 23.209 21.920 24.725 26.217 24.736 27.688 29.141 24.996 27.488 30.578 26.296 28.845 32.000 27.587 30.191 33.409 28.869 31.526 34.805 30.144 32.852 36.191 *Note: A more extensive table is provided as Table 3 of Appendix B (available online). 28.412 31.410 34.170 37.566 29.615 32.671 35.479 38.932 40.289 41.638 42.980 30.813 33.924 36.781 32.007 35.172 38.076 33.196 36.415 39.364 34.382 37.652 40.646 35.563 38.885 41.923 36.741 40.113 43.195 46.963 37.916 41.337 44.461 48.278 39.087 42.557 45.722 49.588 40.256 43.773 46.979 50.892 51.805 55.758 59.342 63.691 14.953 16.791 18.493 20.599 22.164 24.433 26.509 29.051 37.485 40.482 43.188 46.459 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 74.397 79.082 83.298 88.379 44.314 45.642