The U.S. Census Bureau compiles information on 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.

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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ence IPC OPC | OMA | Total 75 106 46 227 $15,000-S34,999 106 16 6 328 $35,000-$74,999 98 18352333 14 164 327 552 173 1052 Under $15,000 $75,000 and over 48 102 Total