Listed below are the weights (in grams) of a simple random sample of United States one-dollar coins (from Data Set 20 in Appendix B). Do those weights appear to come from a population that has a normal distribution? Why or why not?

Transcribed Image Text:

Data Set 20: Coin Weights (grams) The "pre-1983 pennies" were made after the Indian and wheat pennies, and they are 97% copper and 3% zinc. The "post-1983 pennies" are 3% copper and 97% zinc. The “pre-1964 silver quarters" are 90% silver and 10% copper. The "post-1964 quarters" are made with a copper-nickel alloy. STATDISK: Data set name is Coins. Minitab: Worksheet name is COINS.MTW. Excel: Workbook name is COINS.XLS. TI-83/84 Plus: App name is COINS, and the file names are the same as for text files. Text file names: Text file names are CPIND, CPWHT, CPPRE, CPPST, CPCAN, CQPRE, CQPST, CDOL. Indian Wheat Pre-1983 Post-1983 Canadian Pre-1964 Post-1964 Dollar Pennies Pennies Pennies Pennies Pennies Quarters Quarters Coins 3.1366 3.1582 3.0406 3.0762 3.0398 3.0630 2.5113 3.2214 6.2771 5.7027 8.1008 3.0487 3.0755 6.2371 2.4907 2.5024 3.2326 5.7495 8.1072 2.9149 3.1358 2.9753 3.1692 3.0476 3.1029 3.0377 2.4662 2.8357 6.1501 6.0002 5.7050 5.5941 8.0271 8.0813 2.5298 2.4950 3.1043 3.1274 3.3189 6.1275 5.7247 8.0241 2.5127 3.2612 6.2151 5.6114 8.0510 7.9817 3.0775 3.1038 3.1086 3.0586 3.0603 3.0502 3.1083 3.1141 3.0976 2.4998 3.2441 6.2866 5.6160 5.5999 2.4848 2.4823 2.5163 2.5222 6.0760 6.1426 6.3415 8.0954 8.0658 8.1238 2.4679 2.7202 5.7790 5.6841 3.0862 2.5120 3.0570 6.1309 6.2412 5.6234 8.1281 3.0765 2.5004 5.5928 8.0307 3.1114 3.1028 3.0522 2.5248 2.5058 6.1442 6.1073 5.6486 5.6661 8.0719 8.0345 8.0775 3.0965 3.0816 3.0054 3.1934 2.4900 2.5068 2.5016 2.4797 2.5067 2.5139 2.4762 3.0546 6.1181 6.1352 5.5361 3.0185 5.5491 8.1384 3.0712 6.2821 6.26 47 6.2908 6.1661 5.7239 8.1041 3.1461 3.0717 5.6555 3.0185 3.1267 3.0546 3.0817 8.0894 8.0538 8.0342 5.6063 5.5709 5.5591 6.2674 6.2718 3.1524 3.0704 3.0786 2.5004 5.5864 3.0797 3.0713 3.0631 3.0866 3.0131 2.5170 6.1949 6.2465 6.3172 5.6872 3.1535 3.0480 3.0050 3.0290 3.1038 2.4925 2.4876 2.4933 2.4806 5.6274 5.6157 3.0763 6.1487 5.6668 5.7198 6.0829 6.1423 3.1299 3.0846 3.0917 3.0877 2.9593 2.4907 5.6694 5.5454 3.0357 2.5017 2.4950 6.1970 6.2441 6.3669 3.0064 5.6646 5.5636 5.6485 5.6703 5.6848 3.0936 2.4973 6.0775 6.1095 6.1787 3.1031 3.0966 2.5252 2.4978 3.0408 2.9800 3.0561 3.0994 3.0934 2.5073 3.1340 2.4658 6.2130 6.1947 5.5609 5.7344 2.4529 2.5085 6.1940 6.0257 6.1719 6.3278 5.6449 5.5804 5.6010 5.6022