In this activity you will investigate the differences between two major brands of soda pop. (Example Pepsi Vs. Coke, Orange Crush Vs. Kroger Orange, A&W Vs. Kroger Root Beer, etc ...) 1. What populations are you studying? 2. To compare, decide if you want to use independent (10.1, 10.2) or matched sampling (10.3). Which would be better and why? (Note: this is important! Hopefully you chose "matched") 3. You will need several taste testers and a way to keep everything as unbiased as possible. Consider carefully what things would need to be considered to do this. Example: Would the pop brand they tasted first have any bearing on the outcome? 4. Explain carefully how you set up the test and what you did to avoid any kind of potential bias. Data Pepsi Ashley Dave Sue Josh Nannette Steve Coke 6 8 7 9 8 9 7 8 6 8 8 6 To test and see what Americans think about the future, go to Polling Report. Under NBC News/Wall Street Journal Poll conducted by Hart Research Associates, consider the results to the question: "Do you feel confident or not confident that life for our children's generation will be better than it has been for us?" Are Americans more pessimistic about the future than they were ten years ago? 1. Run a hypothesis test to see if the percentage of people in 2014 that responded "not confident" has increased significantly since 1993. Note that it states on the website that the samples are of size 500. Use alpha = .05 Run the test using the Test Statistic / Critical Value approach. Set up the null and alternative hypotheses and Show all your work. Make sure to explain what the test results tell you in the context of the problem. 2. Why or why not are you surprised by these results? 3. What is the p-value? Run the test using the p-value / level of significance approach. 4. What is the population being studied in this test? 5. What are the population parameters that are being measured? 6. What cautions may there in using survey (polling data) such as this? NBC News/Wall Street Journal Poll conducted by Hart Research Associates (D) and Public Opinion Strategies (R). July 30-Aug. 3, 2014. N=approx. 500 "Do you feel confident or not confident that life for our children's generation will be better than it has been for us?" Confident % Not confident % Unsure % 7/30 - 8/3/14 21 76 3 5/16-20/12 30 63 7 8/26-/30/10 27 66 7 12/11-14/09 27 66 7 6/12-15/09 31 57 12 9/19-22/08 RV 35 56 10 12/14-17/07 30 64 6 1/07 33 60 7 7/06 27 65 8 12/01 49 42 9 25 68 7 9/93 12/92 41 52 7