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5. The Tampa Bay Skeptics performed an experiment to see whether an acclaimed psychic has
extrasensory perception (ESP). A crystal was placed, at random, inside 1 of 10 identical boxes
lying side by side on a table. The experiment was repeated seven times, and x, the number of
decisions, was recorded. (Assume that the seven trials are independent.) a. If the psychic is
guessing (i.e., if the psychic does not possess ESP), what is the value of p, the probability of a
correct decision on each trial? b. If the psychic is guessing, what is the expected number of correct
decisions in seven trials? c. If the psychic is guessing, what is the probability of no correct
decisions in seven trials? d. Now suppose the psychic has ESP and p=.5. What is the probability
that the psychic guesses incorrectly in all seven trials?

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5 The Tampa Bay Skeptics performed an experiment to see whe.pdf

  • 1. 5. The Tampa Bay Skeptics performed an experiment to see whether an acclaimed psychic has extrasensory perception (ESP). A crystal was placed, at random, inside 1 of 10 identical boxes lying side by side on a table. The experiment was repeated seven times, and x, the number of decisions, was recorded. (Assume that the seven trials are independent.) a. If the psychic is guessing (i.e., if the psychic does not possess ESP), what is the value of p, the probability of a correct decision on each trial? b. If the psychic is guessing, what is the expected number of correct decisions in seven trials? c. If the psychic is guessing, what is the probability of no correct decisions in seven trials? d. Now suppose the psychic has ESP and p=.5. What is the probability that the psychic guesses incorrectly in all seven trials?