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 states that $\mu$ $\geq$ 60.

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The null hypothesis for a one-tailed test expecting an increase states that $\mu \leq 60$, indicating no effect or a decrease.

A Researcher Administers a Treatment to a Sample from a Population