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Day 1

Day 1 in AP Statistics

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Day 1

  1. 1. Section 5.1
  2. 2. • A probability is a number between zero (never occurs) and one (always occurs) that describes the likelihood of an event. • An event is a subset of the possible outcomes in a chance process. • The compliment of an event is the opposite of the event. That is, the even does not happen. Ex: Let W be the event that we predicted which cup had the bottled water. P(W) = PC(W) =
  3. 3. • The number of times an event happens is known as the frequency of that event. Our frequency was ____ • The relative frequency is the value calculated by dividing the number of times an event occurs by the total number of times an experiment is carried out (written as a fraction, decimal, or %). Our relative frequency was ______
  4. 4. • Imagine that you were to flip a coin 10 times and write down your results (use H for heads and T for tails)
  5. 5. • Flip a penny 10 times and record your results. • Label your first list “predictions” • Label your second list “actual” • The probability of an event can be thought of as its long-run relative frequency when the experiment is carried out many times.
  6. 6. • Believers think that if you flip TTTTTT then the next flip of a coin is more likely to be H. It is true that in the long run heads will appear half the time. What is a myth is that future outcomes must make up for any imbalance. • Coins and dice have no memories! • After 10,000 flips the result of the first six flips doesn’t matter.