An experiment is externally valid if:
a. the outcome can be attributed to the independent variable only.
b. the results generalize to other settings.
c. the results are attributed only to external variables.
d. there are no alternative explanations of the findings.
Question 2
An experiment is internally valid if:
a. the outcome can be attributed to the independent variable only.
b. the results generalize to other settings.
c. the results may be attributed to either the independent variable or a confounding variable.
d. the internal variables are operationally defined.
Experiment of Lederberg and Tatum demonstrating gene transfer in E. coli.
A Schematic Description of the Experiment by Maviel et al. (2004)
Schematic Diagram of Steam-to-air experiment (CHE415 Unit Operations)
Rosenthal and Fode’s Rat Experiment
Evaluating an experiment (metabolic pathway)
The outcome of a mating between individuals heterozygous at two genes determining their ABO blood ty