Polling How accurate are pollsters in predicting theoutcomes of congressional elections? The table shows theactual number of Democratic party seats in the House ofRepresentatives and the number predicted by the Galluporganization for nonpresidential election years betweenWorld War II and 1998.a) Is there a significant difference between the numberof seats predicted for the Democrats and the numberthey actually held? Test an appropriate hypothesisand state your conclusions.b) Is there a strong association between the pollsters’predictions and the outcomes of the elections?Test an appropriate hypothesis and state yourconclusions. Democratic Party CongressmenYear Predicted Actual1946 190 1881950 235 2341954 232 2321958 272 2831962 259 2581966 247 2481970 260 2551974 292 2911978 277 2771982 275 2691986 264 2581990 260 2671994 201 2041998 211 211
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
Polling How accurate are pollsters in predicting the
outcomes of congressional elections? The table shows the
actual number of Democratic party seats in the House of
Representatives and the number predicted by the Gallup
organization for nonpresidential election years between
World War II and 1998.a) 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.
b) Is there a strong association between the pollsters’
predictions and the outcomes of the elections?
Test an appropriate hypothesis and state your
conclusions.
Democratic Party Congressmen
Year Predicted Actual
1946 190 188
1950 235 234
1954 232 232
1958 272 283
1962 259 258
1966 247 248
1970 260 255
1974 292 291
1978 277 277
1982 275 269
1986 264 258
1990 260 267
1994 201 204
1998 211 211
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