Consumer psychologists wants to know whether the type of packaging used for potato chips has the same appeal for all people or whether that appeal depends on income of the consumer. One hundred people from high income group and 100 people from low income group are randomly selected for and interviewed regarding their preference for packaging. The following results were obtained : Data is in the following form
Package type High Income low income
Metalic packaging 36 84
Waxed paper 39 51
Cellophane 16 44
no preference 9 21
What I need to know is what would be the null hypothesis and the alternative hypothesis and what significance test would be used?