normal and t dist	with 30 degrees of freedom and more, a t-distribution approximates the standard normal distribution very closely, and the difference between both becomes negligible	30?
3 families of distributions and their parameters	normal (mean and variance) t (degrees of freedom) F (degrees of freedom x2)	df, mu, squared sigma
based on normality	many calculations based on the properties of that distributions -normally distributed variable? QQ-plot -to what extent?
quantiles and probabilities	p(q=...) is always 0 p(q<...) or p(q<= ...) is the same probability and percentage is the same sometimes

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