I.We have a random sample of 200 U.S. adults who are questioned regarding their political affiliation and opinion on a tax reform bill. The observed contingency table is given below:

favor opposed Total

democrat 100 20 120

republican 30 50 80

Total 130 70 200

Conduct a test to determine if the political affiliation and their opinion on a tax reform bill are dependent at the significant level, = 0.05.

II.Males and females were asked about what they would do if they received a $100 bill by mail, addressed to their neighbour, but wrongly delivered to them. Would they return it to their neighbour? Of the 69 males sampled, 52 said yes and of the 131 females sampled, 120 yes as presented in the following table:

Sample X N Sample p

1 52 69 0.7536

2 120 131 0.9160

Does the data indicate that the proportions that said yes are different for male and female at a 5% level of significance?