Q. A researcher is interested in the effects of a preschool program on later school performance. Because she is concerned that socio-economic-status (SES) is a potential extraneous variable in her study, she picks^&tyldren to study who are only from low SES homes. The control technique she used in this study was- ---- (Solved)

1. Matching

2. Random assignment

3. Holding the extraneous variable constant

4. Statistically controlling the extraneous variable

  • c. Holding the extraneous variable constant
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