QuestionSBA
QuestionChoice
Statistical power is the likelihood that an effect will be detected in the sample when one exists in reality. To increase statistical power, the sample size should be increased. Increasing the sample size reduces sampling variability; providing more precise estimates, increasing test sensitivity, narrowing confidence intervals, and improving the ability to detect both large and small effects.
10025478
d
It is unrelated to sample size
QuestionChoice
This is the correct answer. Statistical power is the likelihood that an effect will be detected in the sample when one exists in reality. If we increase the significance level, we lower the bar for statistical significance, which makes it easier to obtain significant results. This therefore increases statistical power.
10025475
a
It increases with increasing significance level
QuestionChoice
Statistical power is the likelihood that an effect will be detected in the sample when one exists in reality. Greater statistical power is associated with a smaller standard deviation, or less variability in the data. This means a smaller sample size is required to achieve the same level of power, as it becomes easier to detect true effects or relationships in the data.
10025477
c
Greater statistical power is associated with a greater standard deviation
QuestionChoice
Statistical power is the likelihood that an effect will be detected in the sample when one exists in reality. Greater statistical power is associated with a greater effect size. The effect size refers to the magnitude of the difference between groups or variables in a study. A larger effect size indicates a more substantial difference. The larger the effect size, the stronger the true effect is.
10025479
e
Greater statistical power is associated with a lower effect size
QuestionChoice
Statistical power is the likelihood that an effect will be detected in the sample when one exists in reality. To increase statistical power, the sample size should be increased. Increasing the sample size reduces sampling variability; providing more precise estimates, increasing test sensitivity, narrowing confidence intervals, and improving the ability to detect both large and small effects.
10025476
b
It increases with decreasing sample size
Concept
Chapter
2693
4354
Statistical significance
Topic
178
Medical Statistics
17493
A researcher gathers data on the effectiveness of a novel antidepressant medication in reducing symptoms of low mood. They take care to ensure adequate statistical power.

Which of the following is true of statistical power?
a