Explain each sampling technique discussed in the “Visual Learner: Statistics” in your own words, and give examples of when each technique would be appropriate.
What are the assumptions for conducting a paired or dependent samples t -test in a study? Which of these assumptions do you think were met by the Lindseth et al. (2014) study?
- In the introduction, Lindseth et al. (2014) described a “2-week washout between diets.” What does this mean? Why is this important?
- What is the paired t -test value for mood (irritability) between the participants ’ consumption of high- versus low-aspartame diets? Is this result statistically significant? Provide a rationale for your answer.
- State the null hypothesis for mood (irritability) that was tested in this study. Was this hypothesis accepted or rejected? Provide a rationale for your answer.
- Which t value in Table 2 represents the greatest relative or standardized difference between the high- and low-aspartame diets? Is this t value statistically significant? Provide a rationale for your answer.
- Discuss why the larger t values are more likely to be statistically significant.
- Discuss the meaning of the results regarding depression for this study. What is the clinical importance of this result?
- What is the smallest, paired t -test value in Table 2? Why do you think the smaller t values are not statistically significant?
- Discuss the clinical importance of these study results about the consumption of aspartame. Document your answer with a relevant source.
- Are these study findings related to the consumption of high- and low-aspartame diets ready for implementation in practice? Provide a rationale for your answer.
