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# Scatter Diagram & Correlation Problems

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1. The three problems in the attached file to be solved are #10, #14 and #24. They are circled and hi-lited in yellow.

2. The least-squares regression line is a model that describes the relationship between two variables. Now that you have read about regressions and hypothesis tests, you will collect data to create a least-squares regression to interpret.

- Use the ruler to measure the thickness of a single page of the text. Which unit of measurement did you use and why?
- Grouping the pages (one page is one sheet), complete the following table:

No. of pgs. 25 50 75 150 200 225
Thickness

- Compute the least-squares regression line for your data.
- Use your model to estimate the thickness of a single page of the text by letting x=1. Is the value you obtained reasonable?
- Use your model to estimate the thickness of a single page of the text by interpreting the slope. Is the value you obtained reasonable?
- What, if anything, could you do to improve the model?

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#### Solution Summary

This solution answers several problems on scatter diagrams and correlations. The ruler to measure the thickness of a single page of the text are given.

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