# 6D, 7ABCE

**Created:**2011-02-24

**Last Modified:**2011-06-29

- Subtracting and adding the margin of error from the sample proportion.
- You can be 96% confident that the true population proportion lies within this interval

- probability of 0 means that the event in impossible
- probability of 1 means the event is certain

- It is based on a model in which all outcomes are equally likely
- it is determined by dividing the number of ways an event can occur by the total number of possible outcomes

- It is based on observations or experiments
- it is the relative frequency of the event of interest

- independent if the outcome of one event doesn't affect the probability of the other event
- P(A and B) = P(A) x P(B)

- dependent if the outcome of one event affects the probability of the other event
- P(A and B) = P(A) x P(B given A)

- non-overlapping if they cannot occur together
- P(A or B) = P(A) + P(B)

- overlapping if they can occur together
- P(A or B) = P(A) + P(B) - P(A-B)

- Order does matter
- nPr = n!/(n-r)!

- Order does not matter
- nCr = n!/(n-r)r!

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