State in detail under what conditions it is possible to make a causal inference from a comparison of means between two or more groups of individuals.

Ava-May Nelson 2020-11-09 Answered
State in detail under what conditions it is possible to make a causal inference from a comparison of means between two or more groups of individuals.
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Expert Answer

Maciej Morrow
Answered 2020-11-10 Author has 98 answers
An inference is the conclusion or opinion on a known fact. To make a casual inference the selected population has to be random and the means taken from random population sample has to t test mainly used for comparison. Since here it is two or more groups of individuals they may be independent so sample t test can be used for inference.
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GroupSample sizemeanStandard deviationBreastfed2313.31.7Formulafed2312.41.8DIFF=BreastFormula230.91.4

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