STAT 100 Lecture Notes - Lecture 2: Simple Random Sample

• School: Simon Fraser University
• Department: Statistics
• Course: STAT 100
• Professor: Gamage Perera

Document Summary

Town talk: louisiana newspaper in 1999 asked readers to call in to vote about whether an ambulance service should maintain its monopoly. Automated system: callers dialed one number for yes and another for no . Got lots of response much of it from the offices/homes of the ambulance company employees! Call-in polls tend to attract those who have strongly held views. Biased sampling method: a sampling design that systematically favours certain outcomes. Convenience sampling: a sampling method which selects those who are easiest to reach. Voluntary response sample: when the individuals in the population themselves choose whether or not to include themselves in the sample. Typically, researchers identify a simple random sample by having a computer generate random digits. Each digit (or sequence of digits) identifies an individual to be selected from the population. Table of random digits: a low-tech version of a random number generator (p. 667)