Question
4. In tests for extrasensory perception (ESP), an experiment looks at cards that are hidden from the subject. Each card contains I of 5 symbols, and the subject must name the symbol on each card presented. A subject with no suspected psychic ability has, by chance alone, a 20% chance of correctly guessing the symbol on each card presented. Because the cards are independent, the overall pfoportion of success can thus be expected to be 20%. You have no psychic ability and score 28% correct guesses out of a 25 card deck. Is each of the bold values a parameter or a statistic? Explain.
Explanation / Answer
Ans:
20% chance of correctly guessing is a parmeter (population proportion,p,who correctly guesses)
28% score is a sample statistic, for a sample of 25 card deck,a person guesses 28% of the time correctly,so it a statistic.
Parameter represents the population
Statistic represents the sample.