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(1) explain why correlations identified in observational research may not indicate a cause-effect relationship between two variables. (2) calculate a Pearson r using Z scores

(1) explain why correlations identified in observational research may not indicate a cause-effect relationship between two variables. (2) calculate a Pearson r using Z scores (the definition formula). (3) Calculate a Pearson r using the machine formula. (4) explain the relationship between variance and covariance

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