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 (355.28 KiB) Viewed 77 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(1 - 215 400 = 0.0249 400 217 x (1 - 217 404 404 = 0.0248 404 215 215 х 400 = 0.4986 400 O 217 х 404 (1 - 207) 217 404 = 0.4986 2. Construct a 95% Confidence Interval for the population proportion of Prop XYZ supports (use the Wilson adjusted proportion and standard error). O 215 + 1.96 X SE) 400 (215/400) plus-or-minus 1.96 | SE of p-hat O 217 + 1.96 X SE) 404 (217/404) plus-or-minus 1.96* SE of p-tilde o 215 +1.977 x SEP) 400 (215/400) plus-or-minus 1.977 * SE of p-hat o 217 + 1.977 x SEP) 404 (217/404) plus-or-minus 1.977 * SE of p-tilde