The normal probability plot is a graphical technique for normality testing. Used to assess data set follows normal distribution.
The chi square (χ2) distribution is the best method to test a population variance against a known or assumed value of the population variance
The Normal distribution is used to analyze data when there is an equally likely chance of being above or below the mean for continuous data.
Data distributions is a function that specifies all possible values for a variable and also quantifies the relative frequency.
Central tendency is the idea that when using normal data, all three of the main measures (mean, mode, median) tend to be roughly the same.