The U.S. Census Bureau compiles information on the money income of people by type of residence and publishes its finding in Current Population Reports. Independent simple random samples of people residing inside principal cities (IPC), outside principal cities but within metropolitan areas (OPC), and outside metropolitan areas (OMA), gave the following data on income level. Income Residence
a. Identify the populations under consideration.

b. Identify the variable under consideration.

c. At the 5% significance level, do the data provide sufficient evidence to conclude that people residing in the three types of residence are nonhomogeneous with respect to income level?

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Income Residence IPC OPC OMA Under $15,000 75 106 46 $15,000-$34.999 106 161 61 $35,000-$74,999 98 183 52 $75,000 and over 48 102 14 Total 327 552 173 Total 227 328 333 164 1052