An experiment is designed to compare the differences in learning outcomes between learning math from a video game and learning it from traditional
classroom activities. The experiment finds no difference between the two.
Which experiment method is important for controlling bias?
A. Developing a video game with subjects' input
B. Randomly assigning students to the two different groups
C. Asking the subjects which group they preferred to be in
D. Using classroom activities with researchers' input

B. Randomly assigning students to the two different groups

Explanation:

The bias can be controlled by making use of the randomized block design where we divide the subject into subgroups also called blocks and randomly assign treatment conditions to each block.

In this case, the blocks or sub groups are learning math from a video game and learning it from traditional classroom activities.

So the best way to control the bias is by randomly assigning students to the different groups.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2