Gathering Data

Chapters 11-13

Things to Remember:

Simulation: Come Over To Rowayton Regarding Swim Club

Sampling:SRS is simplest sampling type but not always the most practicalSystematic Sample: Choose the 1st subject randomly and then every nth person after thatStratefied Sample: Divide subjects into homogeneous groups, agood example would be to divide students into 9th, 10th, 11th, 12th grade and then take a random sample within each gradeCluster Sample: Divide subjects into heterogeneous groups andthen sample everyone from those groups, a good example wouldbe PE classes.Convenience Samples and Voluntary Samples introduce BiasSampling Error is expected, Bias can be avoided by designing awell designed sample that uses randomness

Experimental Design:

#1 Draw the Diagram (Make sure to put “Random”, “Block”, “Evaluate/Compare” on diagram)#2 Identify the Subjects/Experimental Units, Factors, Levels andTreatments#3 Tell specifically how you will randomly assign subjects to treatments#4 Tell specifically how you will evaluateBlock before Random AssignmentBlinding reduces confoundingSingle Blind is when administrators/Subjects or evaluators areblindedDouble Blind is when administrators/Subjects and evaluators Are blinded