If the sample data we collect is not collected appropriately, the data we gather may be completely useless.
An observational study allows us to measure certain characteristics, but we don’t modify the subjects which are being studied.
In an experiment we apply a treatment, then we observe its effects on a subject.
Continue reading How To Go About Collecting Sample Data
Parameter – this is always a numerical measurement which describes a characteristic of a population.
Statistic – this is always a numerical measurement which describes a characteristic of a sample.
Though these both may sound similar, a parameter and statistic are not the same at all except for the fact they are both numerical measurements. Since they sound similar it would prove wise to provide a couple of examples to make sure we understand the difference between the 2.
Continue reading Types of Data in Statistics, Some Examples, and Statistics Definitions (Intro to Stats)