A researcher administers a treatment to a sample from a population with a mean of m = 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 m 60.

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The null hypothesis typically states that there is no effect or difference, so in this context, it would state that the mean after treatment is equal to 60 (m = 60), not that it increases. The alternative hypothesis would suggest the increase (m > 60 for a one-tailed test).

A Researcher Administers a Treatment to a Sample from a Population