A research team is reviewing three studies that each suffer from low statistical power. Match each study's situation with the most appropriate strategy for increasing its statistical power.

A researcher is investigating whether listening to classical music while studying improves test scores. In a pilot study, he compared two separate groups of 10 students and found a non-significant result. For his main study, he decides to switch to a within-subjects design, where every student completes one test while listening to music and another test in silence, in order to control for individual differences in student ability.

A researcher finds their study lacks sufficient statistical power to detect a predicted effect. Sequence the following adjustments based on the underlying mechanism they use to boost power, starting with the strategy that reduces unsystematic variability (noise), followed by the one that increases the magnitude of the relationship, and ending with the most common practical method.

A researcher evaluates their underpowered study and concludes that because they cannot increase their sample size, they have no other scientifically valid options for increasing the study's statistical power.

If a research design lacks adequate statistical power, what are the two general ways a researcher can increase it?

A researcher who is unable to increase their sample size can still boost their study's statistical power by strengthening the relationship between variables, which can be achieved through a stronger experimental manipulation or by controlling extraneous variables.

When a research design lacks adequate statistical power, the most common and practical strategy researchers use to boost it is to increase the _____.

A research team wants to optimize the statistical power of their upcoming experiments. Match each researcher's scenario with the specific strategy they are applying to increase statistical power.

A psychology researcher realizes that their between-subjects study lacks adequate statistical power. Without recruiting additional participants, they decide to transition to a within-subjects design to control extraneous variables. By doing so, the researcher is attempting to increase power by strengthening the relationship through the reduction of data _____.

Evaluate the following strategies for addressing an underpowered research design. Sequence the strategies starting with the most common and practical option, followed by the relationship-strengthening option that reduces noise, and ending with the relationship-strengthening option that modifies the independent variable.

Identify and describe the two primary ways a researcher can increase the statistical power of a research design when it is found to be inadequate. Additionally, state which of these options is the most common and practical strategy.

Explain how the researchers can boost the statistical power of their study without increasing the sample size, describing the underlying mechanism of the alternative approaches and how they apply to this research design.

A researcher has designed a between-subjects experiment to test a new therapy but realizes the design has inadequate statistical power. If recruiting additional participants is not feasible, what specific change can the researcher make to the experimental design to reduce noise in the data, and how does this affect statistical power?