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a researcher gave a vitamin treatment to 75 participants predicting an increase in overall health scores....

a researcher gave a vitamin treatment to 75 participants predicting an increase in overall health scores. The sample’s mean turned out to be 16, μ = 15 and σ = 5, . A) Is there a statistically significant of the vitamin treatment if the researcher used a one-tailed Z-test and state why? B) Is there a statistically significant effect of the vitamin treatment if the researcher used a two-tailed Z-test and state why? C) What is the 95% confidence interval?

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