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Level 320

Probability & Statistics


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combination
a selection of items in which order is not important
Fundament Counting Principle
a method of using multiplication to count
n factorial
n! = n(n-1) * ...* 3 * 2 * 1
Permutation
possible outcomes when position is important; ie 24 people run a race, how many outcomes are their for 1sr, 2nd, and 3rd place
probability
is measured between 0 and 1
experimental probability
What the outcomes did turn out to be in an experiment.
sample space
is the set of all possible outcomes
Theoretical Probability
What the outcomes were supposed to be theoretically.
dependent events
when one events effects the outcome of another event (without replacement)
mutually exclusive events
events that cannot happen at the same time
independent events
when one event does not effect the other
Not Mutually Exclusive Event
Two events that can happen at the same time
Bimodal
2 modes
Range of a set of data
The difference between the greatest and least values
box-and- whisker plot
a graphic way to display the median, quartiles, and extremes of a data set on a number line to show the distribution of the data
Mean
the sum of all the values divided by the number of values
interquartile range
the difference between the first and third quartiles
Percentile
The # that falls above i% of the data.
Measure of Central Tendency
Indicates the "middle" of the data set. The mean, median, and mode are the most common.
outlier
a data value that is either much greater or much less than the median
quartile
the lower of this is the value with a quarter of the data below it; the upper of this has a quarter of the data above it
Median
A segment or Ray that joins a vertex to the midpoint of the opposite side
Mode
the most common value
Essay
Research a career that uses statistics. Be prepared to tell me what the career is and what part of statistics they use.