Question: Data was gathered from a random sample of 15 textbooks in a campus bookstore. Two of the variables recorded were the price of the book (in dollars) and the number of pages it contained. The data are displayed in a scatterplot below.

1. Is this study observational study or experiment? Why? ( 2 pts )
2. Correlation coefficients can measure the _______________and _______________of a linear association ( 2 pts )
   i) Strength
   ii) Form
   iii) Direction
   iv) Outlier
3. One of your classmates states that after calculating, he got correlation coefficient r=0. Do you agree with him? Why ? ( 2 pts )
4. Least square regression is to minimize_________________________( 2 pts )
   i) the sum of the residuals
   ii) the sum of the squares of the residuals
5. One of your classmates states that after calculating, he got regression line y =-0.2x+10. Do you agree with him? Why ? ( 2 pts )

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Solution: The downloadable solution consists of 2 pages
Deliverable: Word Document