Review of Last Class
     
        The standard error of a statistic is the standard 
       deviation of the sample statistic, which can be 
       estimated from a bootstrap distribution
     
        Confidence intervals can be created using the 
       standard error or the percentiles of a bootstrap 
       distribution
     
        Confidence intervals can be created this way for 
       any parameter, as long as the bootstrap 
       distribution is approximately symmetric and 
       continuous
   Statistics: Unlocking the Power of Data                                 Lock5
                        Extrasensory Perception
     Is there such a thing as extrasensory perception 
     (ESP) or a “sixth sense”?
     Do you believe in ESP?
             a) Yes
             b) No
   Statistics: Unlocking the Power of Data                                 Lock5
                  Extrasensory Perception
   Statistics: Unlocking the Power of Data                                 Lock5
                  Extrasensory Perception
    
      One way to test for ESP is with Zener cards:
    
      Subjects draw a card at random and telepathically 
      communicate this to someone who then guesses the 
      symbol
   Statistics: Unlocking the Power of Data                                 Lock5
                  Extrasensory Perception
    There are five cards with five different 
       symbols
    If there is no such thing as ESP, what 
       proportion of guesses should be correct?
                a) p = 0                   Because there are 5 
                b) p = 1/4                 cards, each person has a 
                                           1/5 chance of guessing 
                c) p = 1/5                 correctly each time, if 
                d) p = 1/2                 ESP does not exist.
   Statistics: Unlocking the Power of Data                                 Lock5