Is this coin fair A statistics student suspected that his

Chapter 10, Problem 10.31

(choose chapter or problem)

Is this coin fair? A statistics student suspected that his penny was not a fair coin, so he held it upright on a tabletop with a fi nger of one hand and spun the penny repeatedly by fl icking it with the index fi nger of the other hand. In 200 spins of the coin, it landed with tails side up 122 times. (a) Perform a goodness of fi t test to see if there is suffi cient evidence to conclude that spinning the coin does not produce an equal proportion of heads and tails. (b) Use a one-proportion inference procedure to determine whether spinning the coin is equally likely to result in heads or tails. (c) Compare your results for parts (a) and (b).