Which of the Following Is True for the World as a Whole

question 9

Multiple Choice

Which of the following is true for the world as a whole?

• A) During the past 200 years, the income per person of the world has increased sharply, but there has been little change in the years of life expectancy at birth.
• B) During the past 200 years, the years of life expectancy at birth has increased sharply, but there has been little change in the world's income per person.
• C) During the 800 years between 1000 and 1800, the increases in both world income per person and life expectancy at birth were small, but both of these indicators have increased sharply during the past 200 years.
• D) Both income per person   and life expectancy rose steadily during 1000-1800, but neither of these indicators have increased much during the past 200 years as the population of the world has become larger and larger.

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Definitions:

Pooled Variance T-test

A statistical test that combines the variances of two samples to test the hypothesis that the means of two populations are equal under the assumption of equal variances.

Degrees Of Freedom

The number of independent pieces of information in a dataset available for estimating parameters or calculating a statistic, usually defined as the number of observations minus the number of parameters being estimated.

Independent Populations

Populations that have no interaction with each other, implying that the sample from one population is not influenced by the other.

Equal Variances

A condition in statistical analysis where the variances across different groups are assumed to be the same.