If physical control, randomization, and design features do not eliminate the differential effects of extraneous variables among treatment groups, the experiment
a. has been confounded, but causal statements are still possible
b. has been confounded, and no causal statements are possible
c. must be repeated without the presence of extraneous variables
d. loses external validity, but can still salvage internal validity
Question 2
As sample size increases, the distribution of sample means of samples of size n (when randomly selected) approaches a normal distribution is a fundamental assumption of the central-limit theorem.
Indicate whether the statement is true or false
Formation of additional eyes in Drosophila caused by the abnormal expression of a master control gen
Physical map of the E. coli genome
Child with cerebral palsy has abnormal muscle tone and lack of physical coordination.
Research Design in Clinical Psychology
Importance of Considering Gestalt Principles in Product Design
Regions involved in the control of genetic expression of the lac operon