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.
Lake 226 at the Experimental Lakes Area divided in half.
Mechanism of Action of Direct-Acting Antispasmodics
Endocrine and nervous control of blood pressure.
Sympathetic control of adrenal gland.
Control of lipolysis in adipose cells by a cAMP-mediated cascade system
Biological control pits one organism against another