A researcher administers a treatment to a sample from a population with a mean of µ = 60.If the treatment is expected to increase scores and a one-tailed test is used to evaluate the treatment effect,then the null hypothesis would state that µ ≥ 60.

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The null hypothesis in this scenario would state that µ = 60, indicating no change due to the treatment. A one-tailed test aimed at detecting an increase would test against the alternative hypothesis that µ > 60.

A Researcher Administers a Treatment to a Sample from a Population