Question 1
3.25 / 3.25 pts
In the hospital research committee, the group discusses an idea for a research proposal aimed at improving patient outcomes related to prevention of hospital acquired dermal ulcers.One of the team members asks why a power analysis must be done. What is the best response?
The power analysis must be conducted for every research study to meet national regulations.
The power analysis is not a requirement and foregoing this analysis will not have an impact on the study.
The power analysis is not necessary as long as the research investigator makes sure as many subjects are included in the study as possible.
The primary goal of the power analysis is to decide how large a sample is needed to enable statistical judgments that are accurate and reliable.
Question 2
3.25 / 3.25 pts
You are reading a research article on a nursing study directed at gathering knowledge from 100 new mothers on the benefits of breast feeding. You see that a Likert scale was used where 1 indicates no knowledge and 5 indicates a lot of knowledge. The data reveals sixty-seven 1s and twenty-eight 5s, with three 2s and two 4s. You know that this study as a wide _______ of scores.
percentage
standard deviation
variance
range
Question 3
3.25 / 3.25 pts
As you read more closely into the study results, you see that the scores of the new nursing mothers are very far from the mean or average score. You think back on your research class and realize that that this means that the study scores have a large _______________.
range
standard deviation
variance
power
Question 4
3.25 / 3.25 pts
Another study results show all of the scores in the center of the distribution curve. In other words, the average or mean scores are 50%. This means that the study has very little or limited (select all that apply)
Range
Skewness
Variability
Reliability
Question 5
3.25 / 3.25 pts
You are talking to a nurse colleague who is proposing to conduct an innovative research study using warming blankets on patient pre-surgery to determine if post-operative complications are reduced. He tells you that he does not plan to perform a power analysis because he is including all patients scheduled for surgery over the next 6 months which will give him a sample size well over 4000 subjects. Which of the responses below is the most appropriate?
“Performing a power analysis helps to make sure that more subjects are not included than is necessary because excess resources may be used with little added benefit to the study.”
“That is great that you have such a high number of subjects, as the large number of subjects will increase the reliability of your study.”
“Too many subjects will decrease the reliability of the study, regardless of cost.”
“That is a good sample size, but did you get approval for subject payment to make sure there is enough money in the research budget?”
Question 6
3.25 / 3.25 pts
You overhear nurse colleagues talking just before an Institutional Review Board (IRB) meeting? They are debating as to which topic is more critical in research, cost effectiveness or scientific usefulness of the study. As a more seasoned researcher, you join the conversation in order to help resolve the debate. Which of the responses below is best?
“Scientific usefulness in research far outweighs cost effectiveness.”
“Cost effectiveness is paramount. After all, without financial stewardship and resources, the study cannot effectively be conducted.”
“Neither of those issues are important. Cost should not impede scientific inquire. Further, we will not know how useful the research is until we get results.”
“You are both correct. Cost effectiveness in research is equally as important as scientific usefulness.”
Question 7
3.25 / 3.25 pts
You are leading the Research Council and part of the agenda is to report to the team that a power analysis will be conducted prior to starting the study. The rationale for conducting the power analysis is to (Select all that apply)
decide how large a sample is needed to enable statistical judgments that are accurate and reliable.
avoid making a Type II Error.
avoid having a sample larger than necessary.
avoid making a Type I Error.
Question 8
3.25 / 3.25 pts
You have been asked to present the four major measures of variability to your hospital research team, including: (Select of all Apply)
range and interquartile range
skewness
variance
standard deviation
Question 9
3.25 / 3.25 pts
A Nurse Practitioner tells you that she wants to conduct a research study and set the alpha level to <>.05. Which type of error is she trying to avoid?
Type II Error – she will have a less than 5% chance of incorrectly accepting the null hypothesis
Type I Error – she will have a 95% chance of incorrectly rejecting the null hypothesis
Type I Error – she will have a less than 5% chance of incorrectly rejecting the null hypothesis
Type II Error – she will have a 95% chance of incorrectly accepting the null hypothesis
Question 10
3.25 / 3.25 pts
A colleague tells you that she wants to conduct a study, but is afraid of incorrectly rejecting the null hypothesis. In other words, she does not want to make an error and reject the notion that the medication is not effective (accepting that a new chemotherapeutic agent is effective when it is not). This could mean that a cancer patient is taking a drug that is not killing cancer cells which would be detrimental to the patient. This nurse is justified in her fear of making which type of error?
Type IV
Type III
Type I
Type II
