Question: The excel file (amazon.xls) contains data on the two variables, sales (Y ) and income (X) of a sample of 10 observations from 1995 to 2004.

1. Use PHStat to generate descriptive statistics of X and Y . Explain the statistical results
   that you have just obtained.
2. Construct a scatter diagram.
3. Find the least-squares regression line of Y on X without the aid of PHStat as well as
   with the aid of PHStat.
4. Find the least-squares regression line of X on Y without the aid of PHStat as well as
   with the aid of PHStat.
5. Test the null hypothesis at the 0.05 significance level that the regression coefficient of
   the population regression is 0.0 versus the alternative hypothesis that the regression
   coefficient exceeds 0.0. Perform the test without the aid of the computer software as well
   as with the aid of the computer software.
6. Find the 95% confidence limits for the regression coefficient. Set the confidence interval without the aid of the computer software as well as with the aid of the computer software.
   
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   Solution: The downloadable solution consists of 7 pages
   Deliverable: Word Document
   
   
   

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