Exam 10: Experimental Design and Analysis II

If researchers reported that, for a correlated-groups design, t(20) = 3.57, p​

A researcher believes exercise reduces anxiety in women. She identifies a group of women who had not exercised before, but are now planning to begin exercising. She gives them a 50-item anxiety inventory before they begin exercising and administers it again after 6 months of exercising. The anxiety inventory is measured on an interval scale and higher numbers indicate higher anxiety. In addition, scores on the inventory are normally distributed. The scores appear below.​ a) What statistical test should be used to analyze these data? b) Identify H₀ and H_a for this study. c) Conduct the appropriate analysis. d) Should H₀ be rejected? What should the researcher conclude? e)If significant, compute the effect size and interpret this. f)If significant, draw a graph representing the data. g)Calculate the 95% CI.

When we use different subjects in each condition, but they are related on some variable or variables, we are using a _____ design.​

In a research study comparing two conditions, researchers obtain 24 scores from each condition. If this was a within-subjects design, then there were _____ participants in the study.​

_____ is a strength of matched-subjects designs but a weakness of between-subjects designs. ​

Using the same subjects in each condition in an experiment is to using different subjects in each condition in an experiment as _____ is to _____.

Explain what a Latin square is and how it helps with counterbalancing.​

Imagine that you conducted a correlated-groups t test with 12 participants. For a two-tailed test, the t_cv at α = .05 would be​