Example 19.6 The following data indicate the lifetime (in hours) of samples of two kinds of light bulbs in continuous use: Brand A 603 625 641 622 585 593 660 600 633 580 615 648 Brand B 620 640 646 620 652 639 590 646 631 669 610 619 We are required to use the Mann-Whitney test to compare the lifetimes of brands A and B light bulbs.

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