To study the effects of aging, Professor Drake compares the reaction times of 60-year-olds with those of 30-year-olds. She tests all younger subjects in the morning, and all older subjects in the afternoon.
She concludes that aging causes a decline in the speed of responses. This study lacks ________ because of potential ________.
A) external validity; demand characteristics
B) external validity; confounds
C) internal validity; demand characteristics
D) internal validity; confounds
Question 2
Which of the following could be considered a limitation to the experimental method?
A) The laboratory settings can be very artificial.
B) The researcher can't make causal statements.
C) The researcher has very little control over what happens in the study.
D) The researcher can't manipulate the independent variable.
How the study of genomes and proteomes can provide us with connections to different biological level
Palade's use of the pulse-chase method to study protein secretion
History of the number of observed sunspots during the last 250 years, which shows the ~11-year solar
Effects of a Placebo on μ-Opioid Neurotransmission
Principles of amplification of selected fragments of DNA by polymerase chain reaction cycling.
Carons' study