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Why were the farmers not satisfied with only establishing cooperatives ?

1  2  3  4  5  6  7  8  9  10  below is a chart representing portions of résumés from three applicants.                                      excerpts from résumés of three job applicants  job expertise    applicant 1  developed effective techniques for keeping order in the classroom    applicant 2  effectively designed a program for new employees    applicant 3  took many courses in child psychology and human development      which  best  explains the applicants’ careers?

Why is it essential to operationally define the variables in a study?