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# Design Of Experiment. 3.1

Statistics-Math 221.
by

## Abiba Salamhjd

on 23 October 2012

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#### Transcript of Design Of Experiment. 3.1

Section 3.1
Design of
Experiments Group 1:
Abiba, Grace, Essence, Suad,Ben Supa Stats Randomization Placebo Placebo: a dummy treatment. People respond favorably to personal attentionor to a treatment them hope will help them Sometimes patients given a placebo treatment will have a perceived or actual improvement in a medical condition: Placebo Effect Controlled Experiments Uncontrolled experiments can be dominated by bias. Describes: Response variables, factors, and layout of treatment. In a control goup, all subjects are treated the same . Control groups limit bias. The design of a study is biased if it systematically favors certain outcomes. Vocabulary Words Experimental Units Objects on which the experiment is performed.
Referred to as subjects in people, as in a clinical trial. Best Selling Movie Genres. Disney Movies
5/8 Chick-Flick
2/8 or 1/4 Comedy
1/8 Factor Explanatory variables in an experiment. Can be set by the experimentor. Statistical Inference Statistical techniques for producing data are the foundation of statistical inference. *Answers specific questions with a known degree of confidence Treatment: Obtaining Data Available Data Data produced in the past for some other purpose that may help answer a present question. Anecdotal Evidence Based on haphhazardly selected individual cases, often come to our attention because they are striking in some way. Also tend to be biased toawards one part of the group. Types of Study Sample: A observational study designed to answer specif questions, where the study group is sampled from a larger population. Observational vs. Experiment Observational- individuals are observed and measure variables of interest but do not attempt to influence the response. Experiment-we deliberatly impose some treatment on individuals and we observe their response. Thanks for watching! Comparative Experiments Where can we get data to answer a question of interest? Experiment: A designed study where researchers impose treatments on individuals to observe their responses. Things to Remember 1) In an experiment, one or more
treatments are imposed on experimental units(subjects) 2) Each treatment is a combination of levels of the explanatory variables, called factors 3) Design of Expeiment refers to choice of treatment

4) Placebo is "dummy treatment" makes subjects feel like they are being benefited Example From Text: pg. 171 Explain the two types of study. What is a placebo? We deliberatly impose some study in _____ Experimental Units: Movies Movie rating
Targeted audience
Acotrs/ Actresses in the movie T.O.D Wizards of Waverly Place Example: PAGE 164 in text
If a certain group of people like Wizard of Waverly Place we cannot acurately deduce all teenager will, not enough data. Population v Sample Idea of sampling when you study a part to represent the whole. *Level is specific value of a factor Specif experimental condition applied to an experimental unit. Statistical decision-making increases the reliability of the research A Control Treatment Observe Response skip this in your notes. Population v Sample:
Idea of sampling is studying a part to get an ideaabout the whole.
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