Basic Probability
Part 1: Mon, March 15th
Review of Basic Probability
 Formula for p = f / N
Or…p = # possible ways to get outcome of interest
total # possible outcomes
Denominator (total # possible outcomes) also called
“Sample Space” (S)
(cont.)
 Sampling w/replacement – each
individual (outcome) is replaced into
population before next selection
 Sampling w/o replacement – once a
person (outcome) is chosen, it is
kept out of remaining population
Lab 14
 Use applets to demonstrate probability
concepts
 Focus on sample space (all possible
outcomes)
– If a binomial problem (only 2 possible outcomes
on each trial), can determine total # possible
outcomes using 2n, where n=# trials
– Shoot 3 free throws – what is samp space? Should
have 23 = 8 outcomes
– HHH, HHM, HMH, MHH, HMM, MHM, MMH, MMM
(cont.)
 Use unit normal table to determine
probabilities (instead of %s)
associated with different z scores
 Remember z = (x – xbar) / Sx