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17

1. 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?

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

3. 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 signiﬁ cant?

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 ﬁ ndings related to the consumption of high- and low-aspartame diets ready for implementation in practice? Provide a rationale for your answer.

Here,is the answer to exercise 17 of nursing Stat.

17

1. 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?

Answer

The assumptions of conducting a paired sample t-test are:

a) The dependent variable must be measured on a continuous scale which is

interval/ratio scale.

b) The observation should be independent of each other.

c) The dependent variable should be approximately normally distributed.

d) A paired score if necessary due to repeated measure of observation for one group of

subjects.

In the research study by Lindseth et al., the dependent variable considered was the

consumption of aspartame diet measured in mg/kg which is continuous(measured in ratio

scale).Here, observations are also independent of each other as the selection of

participants were random and repeated measured were taken resulting in paired score.

An approximate normal distribution can be assumed in this case as the sample size is

28.

2. In the introduction, Lindseth et al. (2014) described a “2-week washout between diets.”

What does this mean? Why is this important?

A...

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