Calculating Mean for multiple variables into new single variable in SPSS Questionnaire analysis

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Calculating Mean for multiple variables into new single variable in SPSS
(Mean function)
Compute variable
(Questionnaire analysis)
(Likert scale)
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Thank you Prof. suppose we have 3 main variables (independent variable), (dependent Variable) and (Mediating variable). each variable is measured by some already established and validated scale. and each scale has about 4 Dimensions with about 3 statements for each dimension. and all items were scored on a 7-point Likert scale 1=Strongly Disagree to 7=Strongly Agree. How would be the correct analysis process for each dimension and each scale? and how would be the correlation analysis between the 3 variables? and for the total scores of dimensions/scales, should we use averages (means) or sums and why?. thank you very much in advanced for your kind clarification.

anisalshargabi