Answer to Question 1
ANS: D
You determine the sample size needed to obtain sufficient power by performing a power analysis. Power analysis includes the standard power (usually 80), level of significance (usually set at 0.05 in nursing studies), effect size, and sample size. In order to demonstrate statistical significance at a more stringent level (a decreased alpha), the sample size must be increased. The effect size is determined by the magnitude of effect that the intervention produces and, consequently, cannot be adjusted.
Answer to Question 2
ANS: A
As the number of variables under study grows, the needed sample size increases. Adding variables such as age, gender, ethnicity, and education to the analysis plan can increase the sample size by a factor of 5 to 10 if the selected variables are uncorrelated with the dependent variable. Setting beta lower, performing additional reliability and validity tests, and changing the design from correlational to descriptive will not solve the problem of the altered power of the study, due to addition of five variables. Only increasing the sample size will be a practical solution.
Model organisms used to study the genetics of development
Results of the study by Laruelle et al. (1996)
Table 6.1 illustrates the main regime types and their differences. It breaks the regimes into four
Sample root cause analysis: Duplicate dose of a narcotic analgesic.
Study Duddy 1
Fire power Mario