MSN Evidence-Based Practice and Research Methods 2

Question 1

Which sampling method provides the best generalizability to the target population?

Accepted Answer

Simple random sampling

Answer

Simple random sampling gives every member of the target population an equal chance of selection, minimizing selection bias and maximizing external validity.

Question 2

In a randomized controlled trial, blinding is used primarily to reduce which type of bias?

Accepted Answer

Performance and detection bias

Answer

Blinding prevents participants and/or investigators from knowing group assignment, reducing performance bias (altered behavior) and detection bias (subjective outcome measurement).

Question 3

A nurse practitioner implements a quality improvement project using the PDSA cycle. What does PDSA stand for?

Accepted Answer

Plan, Do, Study, Act

Answer

The PDSA (Plan, Do, Study, Act) cycle is a continuous improvement framework used to test and implement changes in healthcare settings incrementally.

Question 4

Which level of measurement allows calculation of a meaningful zero point, permitting ratio comparisons?

Accepted Answer

Ratio

Answer

Ratio measurement has all properties of interval measurement plus an absolute zero, making statements like 'twice as much' mathematically valid.

Question 5

Forest plots in a meta-analysis display confidence intervals for each study. What does it mean when a confidence interval crosses the line of no effect?

Accepted Answer

The result is not statistically significant at the chosen alpha level

Answer

When a confidence interval crosses the null value (e.g., OR=1 or MD=0), the finding does not reach statistical significance because the range includes no difference.

MSN - Master Of Science In Nursing Degree Practice Test

MSN - Master Of Science In Nursing Degree Practice Test

MSN Evidence-Based Practice and Research Methods 2