#### Answer

a) p=0.2
b) Null hypothesis:p=0.2, alternative hypothesis: p is not 0.2.

#### Work Step by Step

a) The claim says that the population's proportion is equal to p=20%=0.2.
b) The null hypothesis says that the population's proportion is equal to p=0.2, whilst the alternative hypothesis says that the population's proportion is not equal to p=0.2.