A researcher administers a treatment to a sample from a population with a mean of $\mu$= 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 $\mu$ $\ge$ 60.

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The null hypothesis would state that the mean score after treatment is not significantly different from the population mean, which is F1F1F1S1F1F1F10 = 60 for this example. Therefore, the null hypothesis would be F1F1F1S1F1F1F10 =F1F1F10 60, with no hypothesis about the direction of the effect (increase or decrease). A one-tailed test would require a specific directional hypothesis, which is not appropriate in this case unless there is strong theoretical or empirical support for the expected direction of the effect.

A Researcher Administers a Treatment to a Sample from a Population