# Statistics for Nursing Research Discussion

Statistics for Nursing Research Discussion

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Statistics for Nursing Research

Exercise 16: Understanding Independent Samples t-test

Questions to Be Graded

1. What do degrees of freedom (df) mean?

1. It is a mathematical concept that describes the freedom of a particular score’s value independent of the other existing scores’ values and the sum of the scores.
2. It is a mathematical concept that describes the freedom of a particular score’s value to vary on the other existing scores’ values and the sum of the scores.

Answer:  Choose an item.

Canbulat et al. (2015) did not provide the dfs in their study. Why is it important to know the df for a t ratio?

1. The df for t-tests allows us to look up t ratios on a statistical table that includes a distribution of the critical values of t to determine the significance of the t values obtained in a study.
2. The df for t-tests allows us to look up t ratios on a statistical table that includes a distribution of the critical values of t to determine the sign (positive or negative) of the t values obtained in a study.

Answer:  Choose an item.

Using the df formula, calculate the df for this study.

1. 87
2. 88
3. 174
4. 176

Answer:  Choose an item.

1. What are the means and standard deviations (SDs) for age for the Buzzy intervention and control groups?

Mean±SD for the Buzzy experimental group and Mean±SD for the control group were:

1. 05±1.51; 8.31±1.69.
2. 15±1.51; 8.41±1.69.
3. 05±1.51; 8.51±1.69.
4. 25±1.51; 8.61±1.69.

Answer:  Choose an item.

Statistics for Nursing Research Discussion

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 your answer.

1. Independent sample t-test. Appropriate.
2. Independent sample t-test. Not appropriate.
3. Paired sample t-test. Appropriate.
4. Paired sample t-test. Not appropriate.

Answer:  Choose an item.

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