DISCUSS THE STRENGTHS AND WEAKNESSES OF CORRELATIONAL AND REGRESSION STUDIES.

PSY520 Graduate Statistics Week 3 Discussion DQ1 Review the video “Linear Correlation” in the Calculations section of the “Statistics Visual Learner” media piece. It is sometimes said that the higher the correlation between two variables, the more likely the relationship is causal. Do you think this is correct? Discuss. DQ2 Discuss the strengths and weaknesses of correlational and regression studies; discuss concepts such as positive and negative correlations, correlation coefficients, confounding, and causality. PSY520 Graduate Statistics Week 4 Discussion DQ1 Explain why there is an inverse relationship between committing a Type I error and committing a Type II error. What is the best way to reduce both kinds of error? DQ2 Review the term Significance Test in the “Statistics Visual Learner” media piece. When a newspaper or magazine article reports the results of a study and draws a conclusion without also reporting whether the results are statistically significant, what are the possible reasons for doing so? How seriously should you take the conclusion offered in such a study?