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 here.
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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Residence IPC OPC OMA Total 97 $5,000-$9,999 36 45 20 101 $10,000-14,9994 57 27 125 $15,000-$24.999 82 122 46 250 $25,00034,999 108 4218 $35,000-$49,999 73 126 40 239 $50,000-$74,99967135 34 236 $75,000 & over 68 146 20 234 466 788 246 1500 Under $5,000 30 49 18 Total