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A researcher wants to determine whether a proclaimed psychic really has any special abilities.

Four decks of regular playing cards are shuffled together so that the researcher has $208\text{ cards}$ in a pile. Half the cards are colored red, and the other half are black. As the researcher looks at each card, the blindfolded psychic calls out the card’s color.

At the $5\%$ level of significance, what is the least number of cards the mind reader must call correctly to show that he is not merely guessing?











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