Question: A researcher wishes to see if the average length of major rivers in the United States is the same as the average length of major rivers in Europe. The data for a sample of rivers is given below in miles. At alpha = .01 is there enough evidence to reject the claim? Source: The World Almanac and Book of Facts, 1999, pp. 458-9.

United States

729 560 434 329 332 360 420 2315 865 330 410 1036 329

800 447 600 1310 652 1243 605 360 525 926 722 850 310

430 532 375 1979 710 545 259 300 470 425

Europe

481 724 820 532 357 505 1776 1122 496 1224 634 230 1420

326 626 877 580 210 447 567 252 824 932 600 634 1124

1575 565 405 2290 675 454