Description Usage Format Source References Examples

Educational researchers randomly assigned 28 ninth-year students in Australia to receive coordinate geometry training in one of two ways: a conventional way and a modified way. After the training, the students were asked to solve a coordinate geometry problem. The time to complete the problem was recorded, but five students in the “conventional” group did not complete the solution in the five minute alloted time.

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A data frame with 28 observations on the following 3 variables.

`Time`

the time (in seconds) that the student worked on the problem

`Treatmt`

factor variable with two levels—

`"Modified"`

and`"Conventional"`

`Censor`

1 if the individual did not complete the problem in 5 minutes, 0 if they did

Ramsey, F.L. and Schafer, D.W. (2002). *The Statistical Sleuth: A
Course in Methods of Data Analysis (2nd ed)*, Duxbury.

Sweller, J., Chandler, P., Tierney, P. and Cooper, M. (1990).
Cognitive Load as a Factor in the Structuring of Technical Material,
*Journal of Experimental Psychology General* **119**(2):
176–192.

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