Related Experiment Video
Updated: Sep 10, 2025

Sampling Soils in a Heterogeneous Research Plot
Published on: January 7, 2019
Sample Size Estimation: Ten Frequently Unanswered Questions
1Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, 1800 Orleans St, Baltimore, MD 21287.
None:
Sample size estimation is a critical component in designing rigorous clinical research, ensuring that studies are adequately powered to detect meaningful effects. Despite extensive literature on the topic and the availability of online resources for sample size calculation, researchers may still find the process challenging. This article addresses practical questions that radiology researchers frequently encounter, with the aim of improving awareness among both researchers and journal readers of the study design elements affecting proper sample size estimation.
Related Concept Videos
Sample Size Calculation
The sample size for the given experiment or sampling effort is fundamental to any study design. Sample size decides the number of...
Contaminants and Errors
Another key consideration is determining the appropriate number of samples required to...
What are Estimates?
The estimate for the mean of a sample is denoted by ͞x, whereas the mean of the population is designated as μ. Further, parameters such...
Sample Proportion and Population Proportion
Distributions to Estimate Population Parameter
Sampling Distribution

