please help with 11 and 12 parts a and b also show me the work its part of my review

12. A few weeks before the senatorial election between incumbent Senator Smirk and his challenger, former Governor Graft, the senator's polling organization wants to know where he should concentrate his campaigning. They take simple random samples of potential voters in the southern and northern portions of the state, and ask them if they have decided who to vote for or are still undecided. Here are the results: Decided on a Still candidate undecided Total Region North 116 6 176 South 148 52 200 Total 264 112 376 (a) Do these data provide convincing evidence that there is a difference the distribution of voters who have decided or are still undecided in the two regions? Use a chi-square test to support your conclusion. .. . (b) The pollsters are concerned that while all 200 people in the "South" sample responded, 24 people (out or the original SRS of 200) in the "North" sample did not respond. Is it possible that the opinions of these people would change the pollsters' conclusions? Explain.Show all your-work. Indicate clearly the methods you use. becweyou wiII~be graded on the canecbzess of your method: as well as on the accuracy and completeness of your results and aqnlanatz'ansa ' 11. Big Box Electronics, 2. large national chain store, has one store in the city of Kingston. One factor in deciding whether to build a second store in the city is whether the cunent store is serving all residents equally well, or whether unequal proporlions of residents from different parts of town are using the store because it's locemd on one side of town. The national managers of Big Box divide Kingston into four geographical regions and determine the percentage o residents who live in each region. Here's what they nd: _M Percentage of - - ulation Then the managers take a simple random sample of 250 shoppers at Kingston's Big Box store and determine which pert of town they come om by asking for Jeir zip code when th are chckin ; out: ' _North mainEast Wet ' ' Is Kingston's only Big Box store used by a higher proportion of the residents in some parts of town than others? Suppoit your conclusion With" an appropriate statistical test