TY - BOOK AU - Christensen,Larry B. TI - Experimental methodology SN - 0205263658 U1 - 150.724 20 PY - 1997/// CY - Boston PB - Allyn and Bacon KW - Psychology, Experimental KW - Psychology KW - Experiments KW - Experimental design N1 - what is science? descriptive research approaches the experimental research approach problem identification and hypothesis formation ethics variables used in experimentation control in experimentation techniques for achieving constancy experimental research design quasi-experimental designs single-participant research designs data collection hypothesis testing external validity the research report ER -