In an experiment, it is essential that
A) the group sizes are equal.
B) the experimental and control groups are comparable at the start of the study.
C) all participants are given a pretest.
D) the groups are equal after the manipulation.
Question 2
Which of the following is essential for a successful control-group design?
A) that the experimental and control groups be comparable at the start of the study
B) that participants be randomly selected from a general population
C) that at least three conditions are manipulated
D) that there be an equal number of male and female participants
Experiment of Lederberg and Tatum demonstrating gene transfer in E. coli.
In one-male group species, extra males typically reside in all-male “bachelor” groups. These are Han
Basic Food Group Choices for a 1,200 Calorie Eating Plan
Files come in many different shapes and sizes. Never use a file without a handle.
Nuts are also a good source of B group vitamins (including folate), and vitamin E
The Meselson–Stahl experimental results