A-B-A-B design could provide the most valid non intervention measure with demonstration of experimental control.
  
In statistics, the experimental design, also known as the design of experiment (DOE), is described as the layout of an information-gathering experiment in which a variation may or may not be present. Typically, controlled experiments use this phrase. In order to make the results more reliable, these tests minimize the impacts of the variable. In this design, a group of people, plants, animals, etc. may participate in an experimental unit's procedure.
Pre-experimental research designs are the most straightforward kind of experimental research designs in statistics. Following the identification of some factors as causes and effects, a group or groups are kept under observation in this method. Typically, this approach is used to determine whether the targeted group need additional research. This is the reason why this procedure is regarded as being economical.
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True sit ins were used as a form of protest during the civil rights movement.
        
             
        
        
        
Answer:
Family/Parents
Explanation:
Agent of socialization refers to a group or individual that has the power to influence the behavior of other people so they can conform to the standard that applied within the society.
The first agent of socialization that teach us about such social rules would be our Family. When we're children we cannot read the laws or understand big social issues by ourselves. During this time, all of our knowledge regarding what socially right or wrong were taught by our parents.
 
        
             
        
        
        
Answer:
Active exclusion 
Explanation:
Active exclusion 
Active exclusion  is refer to that social exclusion that is deliberately done for avoiding or excluding someone or any member. There are broadly two type of social exclusion, passive and active exclusion. The difference between these two is based on intention. Active is intentionally exclusion and Passive is unintentional.
In the given case Sarah has decided not to go in reading group meeting because she want to exclude herself due to her classmate Jessica from the meeting.