Keto firm claims that its weight-reducing drug will cause a weight loss of at least 9 kg within one month. A random sample of 30 subjects is taken and the average weight loss is 7.5 kg. with s = 3.1 kg, a = .01 . Thus; the alternative hypothesis is: Select one: a. H1: u > 9 b. H1: u = 9 c. H1: u < 9 d. H1: u ≥ 9

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