A public health nurse is educating a newly licensed nurse about sensitivity and specificity using a two-by-two table. Which of the following statements by the newly licensed nurse indicates an understanding of the table related to true positives?
"True positives are represented in the table cell that indicates the person does not have the disease and the test indicates disease."
"True positives are represented in the table cell that indicates the person has the disease and the test indicates the person has the disease."
"True positives are represented in the table cell that indicates the person has the disease and the test does not indicate disease."
"True positives are represented in the table cell that indicates the person does not have the disease and the test does not indicate disease."
The Correct Answer is B
Choice A: "True Positives are Represented in the Table Cell that Indicates the Person Does Not Have the Disease and the Test Indicates Disease."
This statement is incorrect. In a two-by-two table used to evaluate diagnostic tests, the cell representing true positives is where both the test result and the actual disease status are positive. This cell indicates that the test correctly identified individuals who have the disease. The statement here describes a false positive, where the test indicates disease, but the person does not actually have it.
Choice B: "True Positives are Represented in the Table Cell that Indicates the Person Has the Disease and the Test Indicates the Person Has the Disease."
This statement is correct. True positives are indeed represented in the cell where both the test result and the actual disease status are positive. This means the test has correctly identified individuals who have the disease. This cell is crucial for calculating the sensitivity of the test, which measures the proportion of actual positives correctly identified by the test.
Choice C: "True Positives are Represented in the Table Cell that Indicates the Person Has the Disease and the Test Does Not Indicate Disease."
This statement describes a false negative, where the person has the disease, but the test fails to detect it. This cell is used to calculate the test's sensitivity, but it does not represent true positives. False negatives are critical to understand because they indicate cases where the test missed the disease.
Choice D: "True Positives are Represented in the Table Cell that Indicates the Person Does Not Have the Disease and the Test Does Not Indicate Disease."
This statement describes true negatives, where the test correctly identifies individuals who do not have the disease. While true negatives are important for calculating the specificity of the test, they do not represent true positives. Specificity measures the proportion of actual negatives correctly identified by the test.
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Related Questions
Correct Answer is D
Explanation
Choice A Reason:
The quick and colorful approach is a method often used for brainstorming and generating ideas in a visually engaging manner. It involves using colorful charts, sticky notes, and other visual aids to help participants think creatively and organize their thoughts. However, this method does not typically involve the use of questionnaires for data collection.
Choice B Reason:
The simplex method is a mathematical approach used for linear programming and optimization problems. It helps in finding the best possible solution from a set of feasible solutions. This method is highly analytical and does not involve the use of questionnaires for data collection or analysis.
Choice C Reason:
The criteria weighting method is used to evaluate and prioritize different options based on specific criteria. Participants assign weights to each criterion based on its importance, and then score each option against these criteria. While this method is useful for decision-making, it does not inherently involve the use of questionnaires for data collection.
Choice D Reason:
Nominal group planning is a structured method for group brainstorming that encourages contributions from everyone. It involves the use of questionnaires to gather individual opinions and then aggregates these responses to identify the most important issues or solutions. This method is particularly effective for prioritizing community needs as it ensures that all voices are heard and considered.
Correct Answer is A
Explanation
Choice A: "I Will Not Know if I Am Going to Be in the Intervention or Control Group."
This statement indicates an understanding of the concept of blinding in a randomized controlled trial (RCT). In an RCT, participants are randomly assigned to either the intervention group or the control group, and they are often blinded to which group they are in to prevent bias. This helps ensure the validity and reliability of the study results.
Choice B: "The Study Will Last for 10 Years. You Will Contact Me Annually for an Interview and Blood Work."
While this statement may describe the duration and follow-up procedures of some studies, it does not specifically indicate an understanding of the key aspects of a randomized controlled trial, such as randomization and blinding. The focus here is on the logistics rather than the methodology of the RCT.
Choice C: "You'll Need to Find Other Participants Like Me but Who Do Not Have This Disease."
This statement suggests a misunderstanding of the typical participant selection process for an RCT. In many RCTs, especially those testing new treatments, participants are selected based on having the condition being studied. The comparison is usually between those receiving the intervention and those receiving a placebo or standard treatment, not between those with and without the disease.
Choice D: "The Survey Will Take an Hour to Complete and Then I'll Be Done."
This statement indicates a misunderstanding of the nature of participation in an RCT. RCTs often involve multiple assessments, follow-ups, and possibly interventions over a period of time. A single survey is unlikely to encompass the full scope of participation in an RCT.
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