STAT 100 Chapter 2: Chapter 2.docx

• School: Simon Fraser University
• Department: Statistics
• Course: STAT 100
• Professor: Derek Bingham

Document Summary

Chapter 2 samples, good and bad: convenience sampling selection of whichever individuals are easiest to reach, voluntary response sample chooses itself by responding to a general appeal e. g. write in or call in opinion polls convenience samples and voluntary response samples often biased biased if statistical study systematically favors certain outcomes voluntary response samples often see answers from people who have strong feelings about an issue, particularly people with strong negative feelings simple random sample (srs) of size n consists of n individuals from the population chosen in such a way that every set of n individuals has an equal chance to be the sample actually selected can use software to generate numbers on the spot table of random digits long string of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, with two properties, each entry in table is equally likely to be any of the 10 digits 0 through 9.