The difference between the control group and the experimental group was （）
A: the training that parents received
B: the age of the children
C: the books that were read
D: the number of the children
A: the training that parents received
B: the age of the children
C: the books that were read
D: the number of the children
举一反三
- What is the difference between experimental group and control group? A: Treatment B: Effect C: Sampling error D: Observation time E: Location
- The biggest difference between Observational studies and Experimental<br/>research is( ) A: Intervention or treatment B: Prospective C: Random allocation D: Paralleled control group E: Blinding
- The difference in epidemiological experimental studies compared with prospective cohort studies is A: Research direction from outcome to causes B: Established a control group C: Interventions were implemented for the experimental group D: Can be used for cause inference E: Can be used to verify the cause of the hypothesis
- ________there a group of children near the lake this time yesterday? A: Were B: Are C: Will D: Was
- There was a (number) of children on the playground. A: class B: great crowd C: small group D: line