Why is it important for a scientist to think about their sample size if they are going to extrapolate their data? (Hint: Think about predicting the rainfall this coming March based on only last year, as compared to predicting it based on the past 30 years.) How might a scientist determine if they have enough samples?

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area