Statistic and Hypothesis


Statistic and Hypothesis

1. What do degrees of freedom (df) mean? Canbulat et al. (2015) did not provide the dfs in
their study. Why is it important to know the df for a t ratio? Using the df formula, calculate
the d for this study?
2. What are the means and standard deviations (SDs) for age for the Buzzy intervention and
control groups? What statistical analysis is conducted to determine the difference in means
for age for the two groups? Was this an appropriate analysis technique? Provide a rationale
for our answer.

3. What are the t value and p value for age? What do these results mean?

4. What are the assumptions for conducting the independent samples t-test?

5. Are the groups in this study independent or dependent? Provide a rationale for your

6. What is the null hypothesis for procedural self-reported pain measured with the W’ong
Baker Faces Scale (W’BF S) for the two groups? W’ as this null hypothesis accepted or rejected in this study?
7. Should a Bonferroni procedure be conducted in this study? Provide a rationale for your answer

8. What variable has a result of t =-6.13S,p = 0.000? What does this result mean?

9. In your opinion, is it an expected or unexpected finding that both t values on Table 2 were
found to be statistically significant. Provide a rationale for your answer.

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.


1. What are the assumptions for conducting a paired or dependent samples t-test in a study?
Which of these assumptions do on think were met b r 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’ consump-
tion of high- versus low-aspartame diets? Is the 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 ratio-
nale 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 statistical and clinical importance of these study results about the consump-
tion of as asprtame. Document ‘our answer with a relevant source.


10. Describe one potential clinical benefit for pediatric patients to receive the Buzzy interven-
tion that combined cold and vibration during IV insertion.