Sadie is redesigning her company's website. She wants to carry out an experiment that involves randomly assigning visitors to either the existing design or the new design. A user's experience is slightly different depending on what type of device (mobile or desktop) they use, so Sadie wants to use a randomized block design. How should Sadie form the blocks

A randomized block design infers that subjects or participants are divided into experimental units called blocks. Sadie's blocks should be formed with users with the same device type allocated to the the same block.

Using a randomized block design means that participants are divided into units based on a certain criteria.

To make an accurate comparison, participants in the same block should use the same type of device and then randomly assigning them to either of the two designs.

Therefore, users in each block should use the same type of device.

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