// Has the author unjustifiably generalized findings, when there is only a limited interpretation. //
Suppose the author has observed that all his subjects have blue eyes.
The acceptable conclusion is that some humans have blue eyes
he cannot from a sample conclude that all humans are blue eyed
Confidence interval
suppoe you have a sample average of 36.... with a confidence interval of 20-55 then the confidence interval allows you to conclude that there is a 95% chance the population average ( whatever it is ) lies between 20 and 55