According to the U.S. Census Bureau publication Demographic Profiles, a relative-frequency distribution of the U.S. resident population by region in 2000 was as follows.

A simple random sample of this year's U.S. residents gave the following frequency distribution.

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a. Identity the population and variable under consideration here.
b. At the 5% significance level, do the data provide sufficient evidence to conclude that this year's resident population distribution by region has changed from the 2000 distribution?

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Region Northeast Midwest South West Rel. freq.0.190 0.229 0.356 0.225 RegionNortheast Midwest South West Frequency 45 42 92 71