A researcher asks random samples of residents of two separate counties as to whether they had purchased organically grown food in the last three months. He wants to determine whether the proportion of residents of one county who purchase organically grown food is greater than the proportion of residents of the second county who purchase organically grown food. Choose the appropriate test and name the population(s).   a) Two-proportion z-test; one population is all adults who buy organically grown food and the other population is all adults who do not buy organically grown food.   b) Two-proportion z-test; one population is all residents of the first county and the other population is residents of the second county.   c) One-proportion z-test; the population is all residents of a state.   d) One-proportion z-test; the population is all residents of the first county.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.