1. Referring to the scatter plot below, please describe, using your own words, the trend between the x-variable and the y-variable.

2. Explain, in your own words, the correlation coefficient and include in your answer what the range values are for 'r' (correlation coefficient). Also, explain what is meant by negative correlation and positive correlation.

3. We learned the equation for the straight line when doing the graphing review and it was in

*y = mx + b* form. Please identify the slope and y-intercept in the linear equation below.

4. The following graph shows the test results for an exam whereby hours studied is graphed versus the grade obtained. Which is the ** independent variable** and which is the

5. Calculate the regression line equation for the following set of numbers. You must either staple your Excel Spreadsheet (highly recommended) or write your solution with all appropriate columns on back of this sheet. All work must be visible.

6. Calculate the correlation coefficient for the following set of numbers. You must either staple your Excel Spreadsheet (highly recommended) or write your solution with all appropriate columns on back of this sheet. All work must be visible.

******Optional 5 points extra credit******

We spoke about David Hume and his *Essay Concerning Human Understanding* and then further talked about how Hume's discussions of correlation and causality are related to statistics. Please discuss, in your own words, *your* thoughts about causality and how causality could possibly be different than correlation. Perhaps five to ten sentences with an example will suffice.

Subject | Mathematics |

Due By (Pacific Time) | 11/15/2014 12:00 am |

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