STAT 100 QUIZ 3
Terms
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- sample standard deviation
- formula p.119
- quartile
- a location measure of a data value; it divides the distribution into four groups.
- percentile
- a location measure of a data value; it divided the distribution into 100 groups.
- Z-score
- the difference between a a data value and the mean, divided by the standard deviation. p.130
- outcome
- the result of a single trial of a probability experiment.
- sample space
- the set of all possible outcomes of a probability experiment.
- compound event
- an event that consist of two or more outcomes or simple events.
- the complement of an event
- the set of outcomes in the sample space that are not among the outcomes of the event itself
- rules for complementary events
- if the probability of an event or the probability of its complement is known, then the other can be found by subtracting the probability from 1. formula p.175
- Formula for empirical probablity
- formula p.177
- mutually exclusive
- probability events that cannot occur at the same time.
- independent events
- events for which the probability of the first ocurring does not affect the probability of the second occuring.
- dependent events
- events for which the outcomes or occurence of the first event affects the outcome or occurence of the second event in such a way that the probability is changed.
- permutation
- an arrangement of n objects in a specific order
- combination
- a selection of distinct objects without regard to order.
- tree diagram
- a device used to list all possibilities of a sequence of events in a systematic way.
- expected value
- the theoretical average of a variable that has a probability distribution.
- binomial experiment
- a probability experiment in which each trial has only two outcomes, there are a fixed number of trials, the outcomes of trials are independent, and the probability of success remains the same for each trial. For example: A situation like a multiple -choice question, even though there are four or five answer choices, can be classified as correct or incorrect.
- discrete distributions
- consist of values a random variable can assume and the corresponding probabilities of the values. The probabilities are determined theoretically or by observation.
- law of large numbers
- when a probabiliy experiment is repeated a large number of times, the relative frequency probability of an outcome will approach its theoretical probability