Correlation, Causation, Prediction, Confidence, and Errors

Feb 3rd, 2012
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Northcentral University
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Chapter Seven Problem 1) Look at the scatter plot below. Does it demonstrate a positive or negative correlation? Why? Is there any outliers? What are they? Problem 2) Look at the scatter plot below. Does it demonstrate a positive or negative correlation? Why? Is there any outliers? What are they? Problem 3) The following data come from your book, problem 26 on page 298. Here is the data: Mean daily calories Infant Mortality Rate (per 1,000 births) 1523 154 3495 6 1941 114 2678 24 1610 107 3443 6 1640 153 3362 7 3429 44 2671 7 a) For the above data construct a scatter plot using SPSS or Excel (Follow instructions on page 324 of your textbook). What does the scatter plot show? Can you determine a type of relationship? Are there any outliers that you can see? b) Using the same data conduct a correlation analysis using SPSS or Excel. What is the correlation coefficient? Is it a strong, moderate or weak correlation? Is the correlation significant or not? If it is what does that mean?

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