4. In tests for extrasensory perception (ESP), an experiment looks at cards that

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.

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