A researcher selects a sample and administers a treatment to the individuals in the sample. If the sample is used for a hypothesis test, what does the null hypothesis (H0) say about the treatment?
a. The treatment causes a change in the scores.
b. The treatment adds a constant to each score.
c. The treatment multiplies each score by a constant.
d. The treatment has no effect on the scores.
Question 2Which of the following is directly addressed by the null hypothesis?
a. The population before treatment c. The sample before treatment
b. The population after treatment d. The sample after treatment
Question 3For a hypothesis test evaluating the effect of a treatment on a population mean, what basic assumption is made concerning the treatment effect?
a. If there is a treatment effect, it will increase the scores.
b. If there is a treatment effect, it will decrease the scores.
c. If there is a treatment effect, it will add (or subtract) a constant to each score.
d. If there is a treatment effect, it will multiply (or divide) each score by a constant.
Question 4What is measured by the denominator of the z-score test statistic?
a. A likely distance between M and that would be expected if H0 was true
b. The actual distance between M and
c. The position of the sample mean relative to the critical region
d. Whether or not there is a significant difference between M and
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