Question

Recent studies, as summarized, for example, in E. Mortensen et al. (2002). The association between duration of breastfeeding and adult intelligence. Journal of the American Medical Association, 287, 2365–2371, suggest that breastfeeding of infants may increase their subsequent cognitive (IQ) development. Both experiments and observational stud

What determines whether some of these studies are experiments?

Answer 1

For studies to be Experiments they must fulfil the under criterion:

• An independent variable is the ability stimulus or cause, typically immediately manipulated through the experimenter, so it can also be known as a manipulative variable.
• A based totally variable is the reaction or diploma of effects.
• Extraneous variables — other than the independent variable — doubtlessly could have an effect on the dependent variable, so that they need to be controlled. If possible, you try to keep them consistent between the experimental and control group.
• The experimental organization receives the unbiased variable.
• The manage group is much like experimental, besides it does no longer accumulate the impartial variable. Extraneous variables are balanced between experimental and control businesses.