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We need to randomly assign the subjects to the treatments using slips of paper.

Write the digits $1,2,3$on separate pieces of paper.
Arrange the sheets on a table, numbers facing down.
Mix the sheets together until you can't tell which number belongs where on the table.
Choose one of the slips of paper and apply the treatment that corresponds to the number to the subject.
Continue until all of the subjects have been given a therapy.

We need to randomly assign the subjects to the treatments using technology.

The researchers investigated the effects of survivor guilt on employees when their coworkers are laid off from the company in this study.
As a result, it is assumed that there are $120$ students.
Give each pupil a different number between $1$and $120$.
Using technology, we must randomly allocate the participants to the treatment.
This can be accomplished in the following ways:
To do so, create $40$random numbers ranging from $1$to $120$in Excel and assign them to treatment $1$.
Use the $=$RANDBETWEEN $(1,120)$ function.
Ignore the recurrences.
Select $40$(unique) students for treatment $2$in the same way (who were not in the group for treatment $1$ ).
Treatment $3$will be given to the remaining $40$ kids.

We need to randomly assign the subjects to the treatments using Table D.

As a result, it is assumed that there are $120$ students.
Give each pupil a different number between $1$ and $120$.
Using Table D, we must assign the participants to the treatment at random.
This can be accomplished in the following ways:
To begin, select a row from table D.
Choose a three-digit number as the first.
If the number is between $001$and $120$, choose the student from treatment $1$; otherwise, move on to the next three-digit number.
For treatment $1$, $40$ (unique) pupils from the repeat unit have been chosen.
Select $40$(unique) students for treatment $2$(who were not in the treatment $1$group). The remaining $40$students will be assigned to treatment $3$.