A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population that is known to have a mean of μ = 80.The results will be examined using a one-tailed hypothesis test.Which of the following is the correct statement of the null hypothesis? A)μ 40 B)μ 120 C)μ

Question

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population that is known to have a mean of μ = 80.The results will be examined using a one-tailed hypothesis test.Which of the following is the correct statement of the null hypothesis? A)μ > 40 B)μ > 120 C)μ < 85 D)μ < 80

Quizplus · Accepted Answer

The null hypothesis always assumes that there is no significant difference, so in this case, the null hypothesis would be that the treatment does not increase the scores, resulting in a population mean of μ = 80. Therefore, option D (μ < 80) is the correct statement of the null hypothesis. Option A is incorrect because it assumes that the population mean is already very low, which is not given in the problem. Option B is incorrect because it assumes that the treatment is already effective before conducting the experiment. Option C is incorrect because it assumes that the population mean is already high, which is again, not given in the problem.

A Researcher Is Conducting an Experiment to Evaluate a Treatment