Question

Coin Flips Recall the scenario from the previous page. A psychic claims to be able to predict the outcome of coin flips before they happen. Someone who guesses randomly will predict about half of coin flips correctly. In 100 flips, the psychic correctly predicts 57 flips. Do the results of this test indicate that the psychic does better than random guessing? The hypotheses are H 0: p = 0.50 H a: p > 0.50 where p is the proportion of correct coin flip predictions by the psychic. Use the above information to answer the following three questions. Flag this Question Question 41.7 pts Give the test statistic for this problem. Group of answer choices Z = 1.40 Z = -9.43 Z = -1.40

Answer 1

chance

Explanation:

it's a 50/50 shot, so it's just luck of the flip.

Answer 2

2/3 of the time Z= 1.40

Explanation:

Forget doubled headed coins or sleight of hand, the outcome of a coin toss is dependent on the technique used to flip it, claim experts. With practice, it is possible to correctly predict the outcome up to two-thirds of the time, researchers found.

im in 7nth grade and i know this