MAT-1010 Lecture Notes - Lecture 1: Observational Study, Stratified Sampling

• School: App State
• Department: Mathematics
• Course: MAT-1010
• Professor: Sherry Nikbakhts

Document Summary

Population whatever you take data from. Characteristics the question you are trying to answer/verify. Taking a census: a study of every unit, everyone, or everything, in a population. Sampling: a sample is a subset of units in a population, selected to represent all units in a population of interest. A count from part of the population. Provides a true measure of the population. Detailed information about small sub-groups within the population is more likely to be available. Costs are generally lower results are sometimes available in less time if good techniques are used, the results are very representative of the population. May be difficult to enumerate all units of the population within the available time. Data may not be representative of the population. Observational study: observe and measure specific characteristics, do not attempt to modify the subjects" being studied. Experimental study: some treatment is applied and them proceed to observe its effects on the subjects.