Assessment: To help assess student learning in her developmental math courses, a mathematics professor at a community college im
plemented pre- and posttests for her students. A knowledge-gained score was obtained by taking the difference of the two test scores. (a) What type of experimental design is this?
Randomization is the process of assigning the treatments or tested factors to the experimental units in an experiment in accordance to definite laws or probability is technically known as randomization.
A randomized design relies on randomization to control for the effects of extraneous variables.
In a randomized design, objects or subjects are assigned to groups completely at random. One standard method for assigning subjects to treatment groups is labelling each subject and afterwards, using a list of random numbers to select from the labelled subjects. It is used when the experiment has treatment conditions and subjects. Also, subjects are randomly assigned to different treatments.
