- Inferential Statistics - use sample to make statement about the population
- Hypothesis Testing
- Parameter Estimation
Random Sampling
Process that assures
If not:
Bias
Sampling with Replacement
Sampling without Replacement
Probability
A priori - reason alone
A posteriori - empirical (after the fact)
Fraction
Addition Rule - Probability of A or B = Probability of A + B - Probability of A and B
Mutually Exclusive
Exhaustive
Multiplication Rule - Probability of both A and B = P(A)xP(B given A has occurred)
If mutually exclusive =
Independent events - occurrence of one has no effect on the occurrence of the other
Dependent events - occurrence of B is affected by Occurrence of A
Normally Distributed Continuous Variables
P(A) = Area under curve A/Total area under curve
Z scores