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Exercise 23. Selecting Appropriate Analysis Techniques for Studies R117,98   Add to cart

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Exercise 23. Selecting Appropriate Analysis Techniques for Studies

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Exercise 23. Selecting Appropriate Analysis Techniques for Studies

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  • September 9, 2024
  • 5
  • 2024/2025
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Exercise 23 Selecting Appropriate

Analysis Techniques for Studies
1. A researcher surveyed two groups of professionals, nurse practitioners

and physicians, and asked them whether or not they supported expanding the role of

nurse practitioners' (NPs) prescribing privileges, answered as either “yes” or “no.” Her

research question is: Is there a difference between NPs and physicians on proportions of

support for expanded prescription privileges? What is the appropriate statistic to

address the research question?


Inferential statistics are conducted to examine relationships, make predictions, and

determine differences among groups in studies. One of the most common statistical tests

chosen to investigate differences between two independent samples is the independent

samples t -test, which is a parametric inferential statistic. The independent sample t-test only

compares two groups at a time, and the independent variable must be continuous and

normally distributed.


2. What statistic would be appropriate for an associational research

question involving the correlation between two non-normally distributed, skewed

continuous variables?


Spearman Rank –Order correlation coefficient is preferred when one or both of the

variables of data significantly deviate from a normal distribution, or when the variables are

ordinal and cannot be treated as an interval/ratio skilled variable.

, 3. A researcher is interested in the extent to which years of practice among

NPs predicts level of support for expanded prescription privileges, measured on a 10-

point Likert scale. She finds that both variables, years of practice and level of support,

are normally distributed. Her research question is: Does years of practice among NPs

predict level of support for expanded prescription privileges? What is the appropriate

statistic to address the research question?


A paired samples t-test. It is a statistical procedure that compares two sets of data from



one group of people. This test is a parametric inferential statistical test. The dependent

variable in a paired samples t-test must be continuous in normally distributed.


4. What statistic would be appropriate for a difference research question

involving the comparison of two independent groups on a normally distributed

continuous dependent variable?


Independent samples t-test. This test compares two groups at a time, and the

independent variable must be continuous and normally distributed.


5. A statistics professor tests her students' level of knowledge at the

beginning of the semester and administers the same test at the end of the semester. She

compares the two sets of continuous scores. Her research question is: Is there a

difference in statistics knowledge from the beginning to the end of the semester? What

is the appropriate statistic to address the research question, if the scores are normally

distributed?

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