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As the population ages, there is increasing concern about accident-related injuries to the elderly. An article...

As the population ages, there is increasing concern about accident-related injuries to the elderly. An article reported on an experiment in which the maximum lean angle—the furthest a subject is able to lean and still recover in one step—was determined for both a sample of younger females (21–29 years) and a sample of older females (67–81 years). The following observations are consistent with summary data given in the article:

YF: 29, 35, 31, 27, 28, 32, 31, 36, 32, 25
OF: 17, 14, 21, 13, 12


Calculate the test statistic. (Round your answer to two decimal places.)
f =

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