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3.If workers wished to compare two machines, they might formulate a hypothesis that machine A performs better than machine B.They should use a (one tailed/two-tailed)
3.If workers wished to compare two machines, they might formulate a hypothesis that machine A performs better than machine B.They should use a (one tailed/two-tailed) test
4.When comparing the means of two independent samples, the population standard deviations will almost always be _____________ (known/unknown)
7.A test we can use to determine whether the two population variances are equal is:_________
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