Statistical Sciences 1023A/B Lecture 3: Chapter 3 and 4 Lecture Notes
7 Feb 2017
School
Department
Professor
Document Summary
Credit card numbers and student id"s are categorical variables, have no meaning. A fast watch is a biased upwards measurement, a scale that shows lower weight than what is actually there is a biased downwards measurement. Should smoking be allowed or disallowed? (the word banned is powerful, biased. What is your favorite season of the year? (categorical) It is not valid, as everyone can interpret on-time as different, and many may thin actually on-time, not within 15 minutes. But it is reliable, because they are consi ng. ht iased possibly) think on-time is onsistent with it. Explanatory variable: the variable that explains the results. Because nothing has been impo observational studies, background factors have too big an effect to make a c. Observational studies often more readily extend to real world. Representative sample of london: people who cannot be reached be reache the sampling frame. Impossible to know true error, as we don"t know truth.
