Brilliant Flashcards
1
Q
What are the best tools we have for quantifying and understanding unpredictability?
A
Variables and their distributions
2
Q
What is a random variable?
A
A random variable assigns a numerical value to each outcome of a chance event
3
Q
Set of all outcomes for a coin flipped exactly twice.
A
The set of all outcomes, or sample space, is { HH, HT, TH, TT}
HH, HT, TH, TT are not random variables, but the number of heads observed in two flips is.
4
Q
What makes something a variable?
A
A variable exist when numerical values are assigned to random events.
