Correlation_Question - Correlation 1 The paper A...

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Correlation 1. The paper “A Cross-National Relationship Between Sugar Consumption and Major Depression?” (Depression and Anxiety [2002]: 118-120) concluded that there was a correlation between refined sugar consumption (calories per person per day) and annual rate of major depression (cases per 100 people) based on data from 6 countries. The following data were read from a graph that appeared in the paper: a. Compute and interpret the correlation coefficient for this data set. To compute the correlation coefficient, use the table below. Use this equation to calculate the correlation coefficient is: where Sx is the standard deviation of X and Sy is the standard
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Unformatted text preview: deviation of Y. To obtain column 7, multiply the numbers in column 3 by column 5. Recall: . Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 Country Sugar Consumpti on (X) Depression Rate (Y) ()() Korea 150 2.3 US 300 3.0 France 350 4.4 Germany 375 5.0 Canada 390 5.2 New Zealand 480 5.7 Sum= Sum= Sum= b. Is it reasonable to conclude that increasing sugar consumption leads to higher rates of depression? Explain. c. Do you have any concerns about this study that would make you hesitant to generalize these conclusions to other countries? 2. Match the graphs to the correlations. r = 0 r = + 0.3 r = – 0.5 r = – 0.7 r = + 0.9 r = 0...
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  • Spring '14
  • Vidovic
  • Economics, Correlation Coefficient, Correlation and dependence, Pearson product-moment correlation coefficient, Hebrew numerals, Spearman's rank correlation coefficient

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