click below
click below
Normal Size Small Size show me how
Section 5.2
Random Variables
Term | Definition |
---|---|
Random Variable | a variable (typically represented by x) that has a single numerical value, determined by chance, for each outcome of a procedure |
Probability Distribution | a description that gives the probability for each value of the random variable; often expressed in the format of a graph, table, or formula. |
Continuous Random Variable | infinitely many values, and those values can be associated with measurements on a continuous scale without gaps or interruptions |
Discrete Random Variable | either a finite number of values or countable number of values, where "countable" refers to the fact that there might be infinitely many values, but they result from a counting process |
Range Rule of Thumb | most values should lie within 2 standard deviations of the mean |
Expected Value | of a discrete random variable is denoted by E; it represents the man value of the outcomes |