1. Basic concepts in probability

2. Basic Probability
The likelihood (expressed as a fraction, proportion, or percentage) that a specific event will occur
Common definition:
p (A)=number of ways A can occur (#A)
total number of outcomes (#O)

3. Simple Probability
What is the probability of obtaining an ace from a deck of cards?
Out of an entire deck of cards, what proportion are aces?

4. Relative Frequency Is Equivalent To Probability
Grade
Frequency
Relative Frequency 9 2
0.06 8 6
0.19 7 5
0.16 3
0.09 4 1
0.00

5. Probability and the Normal Distribution
The equation is

6. Normal Distribution
The percentages of scores that fall in each of these sections

7. Example Adult height normally distributed = 68 inches, = 6 inches
What percentage of people are taller than 80 inches?
P(X>80) = ?

8. What proportion of the normal distribution corresponds to z-score values greater than z=+1.00