The first step in calculating the sample size is to define the population from which you want to draw your sample. This could be a group of people or items with a specific set of characteristics. Step ...

Wondering how many people in the United States have a smartphone? If you poll 20 people on the street, your survey won’t be representative of the entire American population. But if you just want to ...

Sample size, namely the number of subjects that should be included in a study to reach the desired endpoint and statistical power, is a fundamental concept of scientific research. Indeed, sample size ...