Question

A psychic was tested for ESP. The psychic was presented with 400 cards face down and was asked to determine if the card was one of four symbols: a cross, a star, a circle, or a square. The psychic was correct in 120 of the cases. Let p represent the probability that the psychic correctly identifies the symbol on the card in a random trial.

Using the results above, construct a 99% confidence interval for p.

Answer 1

@TheSmartOne

Answer 2

@pooja195

Answer 3

okay your s should be i believe the square root of ((p)(1-p)/N)

Answer 4

and a z of 2.58, hope that helps

Answer 5

thank you! @Evoker