A group of educational researchers would like to test the effectiveness of educa

Question

A group of educational researchers would like to test the effectiveness of educational toys geared to help children read. Researchers designed an experiment in which a group of preschool aged children spent 2 hours a day for 6 months in a classroom that had "educational" toys including alphabet blocks, electronic reading games, etc. Where as a control group of children spent 2 hours a day for 6 months in a classroom with "non-educational" toys. To minimize bias the researchers used 5 sets of identical twins. Each set of twins had a twin randomly assigned to either the experimental classroom or control classroom. The researchers than recorded the ages in months when the child began to read at the primary level. The results are as follows: What type of experimental design did the educational researchers use in their study? Matched Pairs Design Completely Randomized Design Simple Random Sampling Stratified Random Sampling The use of twins will help control for which biases: IQ differences among children Educational backgrounds Home environment All of the above

Explanation / Answer

QUESTION 16 :
Matched Pairs Design.

This experiment has only two treatment conditions; and subjects are grouped into pairs, based on some variable. Then, within each pair, subjects are randomly assigned to the two treatments.

QUESTION 17 :

All of the above.

Twins are used so as to eliminate the individual differences as far as possible, which in turn reduces the bias.

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