Polling How accurate are pollsters in predicting the outcomes of Congressional elections? The table shows the actual number of Democrat seats in the House of Representatives and the number predicted by the Gallup organization for nonpresidential election years since World War II.

1. Is there a significant difference between the number of seats predicted for the Democrats and the number they actually held? Test an appropriate hypothesis and state your conclusions.

2. Is there a strong association between the pollsters’ predictions and the outcomes of the elections? Test an appropriate hypothesis and state your conclusions.

Democratic Congressmen Year Predicted Actual 1946 190 1950 235 1954 232 1958 272 1962 259 1966 247 1970 260 1974 292 1978 277 1982 275 1986 264 1990 260 1994 201 1998 211 188 234 232 283 258 248 255 291 277 269 258 267 204 211