Probabilities for various outcomes can be determined by the and rules. The addition of probabilities is appropriate when none of the outcomes can occur together. These are called outcomes. They are usually connected by the word 'or' and require the use of the addition rule. When outcomes are not mutually exclusive, don't forget to adjust the addition rule. When probability questions involve clusters of simple outcomes connected by the word 'and', apply the rule. This rule is appropriate because the occurrence of one outcome has no effect on the probability of the other outcome. Outcomes of this kind are called . When the occurrence of one outcome does affect the probability of the other outcome, the probability of the second outcome must be adjusted to reect this. The probability of one event, given the occurrence of another event, is referred to as probability. Areas under the theoretical normal curve can be interpreted as . Generally speaking, common outcomes are associated with a lack of On the other hand, outcomes are associated with statistical significance