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Professor Linda Williams
BUS216
Two or more events are Independent Events if the
     occurrence or nonoccurrence of one of the events
     does not effect the occurrence or nonoccurrence of
     the other event(s)
    Examples of Independent Events:


        Flipping a coin
        Rolling a single die
        Being left-handed and owning a dog
        Eating popcorn and singing Broadway show tunes
Two or more events are Dependent Events if the
    occurrence or nonoccurrence of one of the events
    does effect the occurrence or nonoccurrence of the
    other event(s)

     Examples of Dependent Events:


    Attending college and graduating from High School
    Drawing 2 cards from a deck without replacement
    Picking students for teams in Dodge Ball
Dependent Events        Independent Events
 P(3 Aces in a Row) =    P(3 Aces in a Row) =




                         Sample Space UNCHANGED
Sample space DECREASES
A box contains 15 parts, 3 of which are defective.
        (A) If you randomly select two parts from the box,
without replacement, what is the probability that both
parts are defective?




  (B) If you randomly select two parts from the box,
  with replacement, what is the probability that both
  parts are defective?
First: Determine if the events effect the outcome of
one another!

If Dependent – BOTH the sample size and likelihood of
success decrease in each event

If Independent – the sample size and the likelihood of
success remain fixed in each event

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Independent or Dependant Probability

  • 2. Two or more events are Independent Events if the occurrence or nonoccurrence of one of the events does not effect the occurrence or nonoccurrence of the other event(s) Examples of Independent Events:  Flipping a coin  Rolling a single die  Being left-handed and owning a dog  Eating popcorn and singing Broadway show tunes
  • 3. Two or more events are Dependent Events if the occurrence or nonoccurrence of one of the events does effect the occurrence or nonoccurrence of the other event(s) Examples of Dependent Events:  Attending college and graduating from High School  Drawing 2 cards from a deck without replacement  Picking students for teams in Dodge Ball
  • 4. Dependent Events Independent Events P(3 Aces in a Row) = P(3 Aces in a Row) = Sample Space UNCHANGED Sample space DECREASES
  • 5. A box contains 15 parts, 3 of which are defective. (A) If you randomly select two parts from the box, without replacement, what is the probability that both parts are defective? (B) If you randomly select two parts from the box, with replacement, what is the probability that both parts are defective?
  • 6. First: Determine if the events effect the outcome of one another! If Dependent – BOTH the sample size and likelihood of success decrease in each event If Independent – the sample size and the likelihood of success remain fixed in each event