1. Before an election, a news agency is interested in the percentage of voters who will support Prop XYZ. You go through

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1 Before An Election A News Agency Is Interested In The Percentage Of Voters Who Will Support Prop Xyz You Go Through 1 (285.6 KiB) Viewed 100 times

1. Before an election, a news agency is interested in the percentage of voters who will support Prop XYZ. You go through careful planning so that your selection of people to survey is as random as realistically possible. You survey 400 people. 215 of them say they will vote "Yes" on Prop XYZ; the rest say they will vote "No." What is the standard error of the Wilson adjusted sample proportion p? 215 400 X ( 215 400 = 0.0249 400 O 212 X (1 404 404 = 0.0248 O 215 V 400 x(1 215 400 = 0.4986 O 217 V 404 *(1- 217 404 = 0.4986 2. Based on this interval, can we be confident that Proposition XYZ will pass with a majority? Yes, 0.5001 is in the interval, indicating that there is evidence of majority support for proposition XYZ. Yes, O is not in the interval, indicating that there is evidence of majority support for proposition XYZ. No, 0.4999 is in the interval, indicating that there is no evidence of majority support for proposition XYZ. No, O is not in the interval, indicating that there is no evidence of majority support for proposition XYZ. 3. With the same survey data, perform a Chi-squared test to see if we have evidence that the proportion of XYZ supporters is over 0.50. Use alpha -0.05. Ho: p = 0.50 Hp > 0.50 What is the resulting x statistic? O 1.125 2.25 O 2.23 O 2.89 4. What is the resulting p-value? 0.2