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Year Question Content
2016 3 ·             Explanatory/response variables

·             Experiment vs. observational study

·             Confounding

2014 4 ·             Mean vs. median

·             Sampling methods and bias

2013 2 ·             Convenience sampling and bias

·             Selecting an SRS with a random number generator

·             Stratified sampling

2011B 2 ·             Observational study vs. experiment

·             Scope of inference

·             Purpose of random assignment

2011 3 ·             Cluster sampling

·             Stratified sampling

2010 1 ·             Treatments

·             Experimental units

·             Response variable

·             Scatterplots and linearity

2010B 2 ·             Simple random sampling

·             Stratified random sampling

2009 3 ·             Random assignment

·             Non-random assignment

2008 2 ·             Non-response bias
2007 2 ·             Control groups

·             Random assignment

·             Blocking

2007B 3 ·             Blocking

·             Randomization

2006 5 ·             Treatments

·             Randomization

·             Sources of variability

·             Generalizibility

2006B 5 ·             Response variable

·             Treatments

·             Experimental units

·             Randomization

·             Replication

·             Confounding

2005 1 ·             Comparing distributions (stemplots)

·             Generalizability of results

·             Sampling variability

2004 2 ·             Blocking

·             Random assignment within blocks

2004B 2 ·             Selection and response bias
2003 4 ·             Random assignment

·             Control groups

·             Generalizibility

2002 2 ·             Matched pairs experiment

·             Double-blind

2002B 3 ·             Designing experiment

·             Blocking

2001 4 ·             Blocking

·             Purpose of randomization

2000 5 ·             Designing experiment

·             Blocking

·             Double-blind

1999 3 ·             Experiment vs. observational study

·             Confounding

·             Cause and effect

1997 2 ·             Designing experiment

·             Blocking