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.
Negative feedback as a mechanism by which homeostatic control systems operate.
The Old River Flood Control Structures
Direct-Aging Antispasmodic Drugs
Dorsiflexion of the foot with direct pressure to bottom of foot with the thumbs.
Birth Control Methods and Abortion
EXPERIMENTAL INSIGHT