In the last presidential election before the candidates began ...

[joblessjake]

In the last presidential election before the candidates began their major campaigns, the percentages of registered voters who favored the various candidates were as follows: Registered Voters Percentages Republicans 34 Democrats 43 Independents 23 After the major campaigns began, a random sample of 400 voters showed that 172 favored the Republican candidate, 164 were in favor of the Democrat candidate, and 64 favored the Independent candidate. Use  = .01 to determine if the proportion of voters who favored the various candidates changed.

Question 2

In 1996, forty percent of the students at a major university were Business majors, 35 were Engineering majors and the rest of the students were majoring in other fields. In a random sample of 600 students from the same university taken in 1997, 200 were Business majors, 220 were Engineering majors, and the remaining students in the sample were majoring in other fields. At a 5 significance level, test to see if there has been a significant change in the proportions between 1996 and 1997.

[karmakat49]

Answer to Question 1

Chi-square = 18.42 > 9.21; proportion has changed.

Answer to Question 2

Chi-square = 13.15 > 5.99; thus, reject H0and conclude there has been a significant change.