## Confidence Interval Calculator

Confidence Interval for the population means when the standard deviation is known. Confidence level, usually written as 100%, on the interval estimate of a population parameter is the probability that the interval estimate will contain the true population parameter.  When [CP_CALCULATED_FIELDS id=”8″] ## Box and Whisker Plot : Explained

A box plot (also known as box and whisker plot) is a type of chart often used in descriptive data analysis to visually show the distribution of numerical data and skewness by displaying the data quartiles (or percentiles) averages. Box plots show the five-number summary of a set of data: the minimum score, first (lower)… ## How to choose a statistical test?

If you are from a non-statistical background it is essentially the most complicated aspect of statistics, are always the basic statistical tests, and how to choose statistical test? In this article I have tried to mark out the distinction between the common statistical tests, the use of null value hypothesis in these tests by outlining…