91影视

Given: thirty students.

There are two treatments: easy maze and difficult maze.

Let us assign a unique number between to each student.

Use slips of paper, a random digit table or calculator to select 15 unique integers between . The corresponding students are then assigned to the easy maze.

The remaining students are assigned to hard maze.

We will then compare the estimates of the time worked among the two treatment groups.

Given: thirty students.

There are two treatments: easy maze and difficult maze.

Let us use two slips of paper, write 鈥淎鈥� on one slip and 鈥淏鈥� on other slip.

Put the slips face down on a table and shuffle them. Let each student randomly select one of the two slips and be sure to return and shuffle the slips around after each drawing. The students who selected the slip containing 鈥淎鈥� will first execute the easy maze and then execute the difficult maze.

The students who selected the slip containing 鈥淏鈥� will first execute the difficult maze and then execute the easy maze.

We will then compare the estimate of the time worked among the easy maze and the difficult maze.

Matched pairs would be more likely to detect the difference in the effects of the treatments because with one subject helps reduce the differences in the experiment. and this method is very effective in this case. And give the unbiased result of the survey.