STATS 7 Lecture Notes - Lecture 5: Simple Random Sample, Observational Study, Royal Institute Of Technology
Document Summary
Chapter 5: sampling: surveys and how to ask questions. Using numerical and graphical summaries to characterize a data set or describe a relationship. Using sample information to make conclusions about a broader range of individuals than just those observed. First ladies wouldn"t be able to represent women of ameria. Ex:5. 2 do penn state students represent other college students. No, how fast ever driven a car. The entire group of units about which inferences are to be made. The smaller group of units actually measured or surveyed. Every unit in the population is measured or surveyed. Every conceivable group of units of the required size from the population has the same chance to be the selected sample. Helps ensure sample data will be representative of population, but can be difficult to obtain. A subgroup of a large population questioned on set of topics. Less costly and less time than a census. 5. 2 margin of error, confidence intervals, and sample size.
