<h2>
Answer:</h2>
People of various categories are found in cities, out of which 'Upper Class' and 'Lower Class' are two of the categories.
<h2>
Explanation:</h2>
There are a number of categories in which an urban population is divided.
The category with the highest income and highest spending capacity is called 'Upper Class. The category with medium levels of income and expenditure is called the 'Middle Class'. The lowest of all categories is the 'Lower Class' which consists of people that have extremely low income and thus, a very low spending capacity.
Like all psychological theories, psychological treatments need to be validated by using:<u> empirical research.</u>
<h3>What is meant by empirical research?</h3>
Research that is based on empirical observation and measurement of phenomena is research that the researcher has personally experienced. The information obtained in this way may be compared to a theory or hypothesis, but the conclusions are still grounded in actual experience. Like all psychological theories, psychological treatments need to be validated by using: empirical research.
Empirical research generates knowledge from actual experience rather than from theory or belief since it is based on observed and measured phenomena.
It is employed to support several hypotheses, advance human understanding, and carry on doing so in order to advance in various sectors. Pharmaceutical corporations, for instance, conduct empirical research to test a certain drug on predetermined or arbitrary groups in order to determine its effects and causes.
Read more on empirical research here:brainly.com/question/6862874
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