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# Day Statistics Terms

### High School Math 1 Chapter 6

Multiplication counting principle If 1 event can occur in m ways and another can occur in n ways, the number of ways both can occur together is m x n.
Addition counting principle If the possibilities being counted can be divided into groups with no possibilities in common, the total number of possibilities is the sum.
Permutation An arrangement of objects in which order is important.
Combination A selection of objects in which order is not important.
Compound event Combines 2 or more events, using the word and or the word or.
Mutually exclusive events No common outcomes.
Overlapping events At least one common outcome.
Independent events One event has no effect on the other.
Dependent events One event affects the outcome of the other.
Conditional probability If events are dependent, the probability the second one will occur, given the results of the first one.
Expected value The sum of the probabilities of an event multiplied by the corresponding outcomes.
Survey Study of one or more characteristics of a group.
Population The entire group you want information about.
Random sample Every population member has an equal chance of being selected.
Stratified random sample Population is divided into groups, and members are selected at random from each group.
Systematic sample A rule (such as every 3rd one) is used to select members of the population.
Convenience sample Easily accessible members of the population are selected.
Self-selected sample Members select themselves by volunteering.
Representative sample Sample accurately relects the characteristics of the population.
Biased sample Sample doesn't represent the population.
Biased question Encourages a particular response.
Measure of central tendency Indicator of the middle of the data.
Measure of dispersion Indicator of how much the data is spread.
Mean absolute deviation Average distance from the mean.
Quartile Median of an ordered data set
Upper quartile Median of the upper half of an ordered data set.
Lower quartile Median of the lower half of an ordered data set.
Interquartile range Difference between the upper quartile and the lower quartile of a data set.
Created by: janeday