In random samples of 250 persons with low incomes,200 persons with average incomes, and 150 persons withhigh incomes, there were, respectively, 155, 118, and 87who favor a certain piece of legislation. Use the 0.05level of significance to test the null hypothesis θ1 =θ2 = θ3 (that the proportion of persons favoring thelegislation is the same for all three income groups) againstthe alternative hypothesis that the three θ’s are notall equal.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.