**Topic 2: Q 1**

**Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?**

**Topic 2: Q 2**

**Explain each sampling technique discussed in the “Visual Learner: Statistics” in your own words, and give examples of when each technique would be appropriate.**

**EXERCISE 17 **

**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? **

**1. ****In the introduction, Lindseth et al. (2014) described a “2-week washout between diets.” What does this mean? Why is this important? **

**2. ****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. **

**4. 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.**

**5. ****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.**

**6. ****Discuss why the larger t values are more likely to be statistically signiﬁcant. **

**7. ****Discuss the meaning of the results regarding depression for this study. What is the clinical importance of this result? **

**8. ****What is the smallest, paired t -test value in Table 2? Why do you think the smaller t values are not statistically signiﬁcant? **

**9. ****Discuss the clinical importance of these study results about the consumption of aspartame. Document your answer with a relevant source. **

**10. ****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. **

Purchase the answer to view it