The following sample data have been collected from independent samples from two populations. Do the populations have different medians? Test at a significance level of 0.05. Use the Mann–Whitney U-test.

Sample 1 Sample 2 550 489 594 538 483 480 542 505 379 433 447 486 Sample 1 Sample 2 438 436 466 425 398 540 560 497 582 415 447 511 528 532 526 576 502 412 446 558 352 572 573 500 488 579 542 467 400 556 473 556 451 383 418 383 571 515 511 515 382 501 510 501 588 353 577 353 465 369 585 492 475 436 384 470 461 563 595 545 506 361 441