The Middle-Class Has Been Experiencing a Steady Increase in Size

question 25

True/False

The middle-class has been experiencing a steady increase in size over the last three decades.

---

Definitions:

Population Standard Deviation

A measure of the dispersion of a population's values from the mean, representing how spread out the population data are.

Confidence Interval

A range of values, derived from the sample data, that is likely to contain the value of an unknown population parameter with a specified level of confidence.

Mean

The central value of a dataset, calculated as the sum of all values divided by the total number of values.

Standard Error

Standard error measures the accuracy with which a sample represents a population, quantifying the variability of the sampling distribution of a statistic.