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D) all of the above. 19. A harmonic mean allows us to: A) calculate a z score B) get two different values for the mean

D) all of the above. 19. A harmonic mean allows us to: A) calculate a z score B) get two different values for the mean C) get one value for variance with unequal sample variances D) get one value for mean with unequal sample sizes 20. A pooled variance allows us to

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