The use of theoretical probability distributions to model populations.
Features of normal distributions:
• continuous variable
• unimodal
• symmetrical
• mean = mode = median
• approximately two-thirds of the distribution lies within one standard deviation of the mean
• approximately 95% of the distribution lies within two standard deviations of the mean
The standard normal distribution with mean 0 and variance 1.
Use of the standard normal table to find probabilities and expected frequencies.
Use of the standard normal table in reverse calculations.
Extension Opportunities – other probability distributions eg uniform, binomial, Poisson.
Significance tests – t, z, Mann Whitney, Wilcoxin signed rank, chi-squared.
Hypothesis Testing Tutorial
