Question

In 2010, among 121 randomly chosen voters polled 65 voted for Jerry Brown. In 2014, among 61 randomly chosen voters polled 36 voted for Jerry Brown. Assume you are interested in an 90% confidence interval for the difference between the corresponding true proportion of votes for Jerry Brown in the 2014 and 2010 elections. 1. Choose the best answer below concerning the confidence interval for the difference between the corresponding true proportions of votes for Jerry Brown in the 2014 and 2010 elections. a) iz b) puz c) ni 112 d) (P - P2) z z P.O.P242 + T12 e) None of the above 2. Choose the correct z-value or t-value that would be used in the 90% confidence interval for the difference between the corresponding true proportion of votes for Jerry Brown in the 2014 and 2010 elections. a) z = 2.576 b) Z = 1.645 t=2.660 c) d) t = 1.671 e) None of the above 3. If we assign group 1 to be the survey from 2014 and group 2 to be the survey from 2010, you may assume the correct confidence interval for the above problem to be (-0.075, 0.181). Based on the interval, choose the most appropriate conclusion from the confidence interval from the statements below. a) We are 90% confident that there is no difference between the corresponding true proportion of votes for Jerry Brown in the 2014 and 2010 elections. b) We are 90% confident that the corresponding true proportion of votes for Jerry Brown in the 2014 was higher than in the 2010 elections. c) We are 90% confident that the corresponding true proportion of votes for Jerry Brown in the 2010 was higher than in the 2014 elections. d) Can't be answered based on the information given. e) None of the above.

Answer 1