A Researcher Wants to Determine the Proportion of Elm Trees

question 97

Essay

A researcher wants to determine the proportion of elm trees in Windsor, Ontario, dying of Dutch elm disease. Past experiments, based on large sample sizes, have shown this proportion to be 0.3. What sample size does the researcher need in order to estimate this proportion to within 0.04 with 95% confidence? Justify your conclusion.

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Definitions:

Foreign Direct Investment

An investment made by a firm or individual in one country into business interests located in another country, typically involving ownership of assets.

Population Growth Rate

The rate at which the number of individuals in a population increases in a given time period as a result of births, deaths, and migration, usually expressed as a percentage.

Developed Countries

Nations with relatively high levels of economic growth and security, characterized by strong infrastructure, high gross domestic product per capita, and generally high standards of living.

Developing Countries

Countries with lower levels of economic development, characterized by lower industrialization and lower human development indices.