The difference between results from the sample and the results that might be obtained from a complete census, inherent in the statistical processes of sampling. This margin of error does not imply a mistake, for probability sample error is calculable, based on sample size and method. Sampling error is also called variance, tolerance factor, or standard deviation.
In today's over-information society, people often become frustrated when they can't keep up with everything they feel they should keep up with. This article explains that it's impossible to keep up... [ more... ]
Does persistence and hard work guarantee that you will achieve your goal? NO! Persistence is an important personality trait, however, hard work without heart doesn't serve you.