An experimental design
a. is one in which the investigator has direct control over at least one independent variable.
b. is less capable of providing evidence of causal relationships than is an exploratory design.
c. is less internally valid than a descriptive study.
d. should be used only in realistic situations.
e. is best suited for longitudinal analysis.
Question 2
Typically, __________ experiments have greater internal validity, and __________
experiments have greater external validity.
a. lab; field
b. field; lab
c. field; field
d. lab; lab
e. The internal and external validities are usually the same for both types of experiments.
The control of breathing via respiratory centres in the mammalian brain.
Experimental evidence of the effect of allelochemicals on plant production.
Summary of greenhouse experimental design and results
Margaret Sanger, birth control pioneer.
Control of the cell cycle by cyclin-dependent kinases, and the checkpoints at which they operate
Control of Respiration