Confidence intervals and Significance Tests for Correlation and Regression (5 of 5)

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Next section: Introduction to multiple regression

Confidence interval for b

1. Compute (r)(s_y/s_x)where r is Pearson's correlation, s_x is the standard deviation of X and s_y is the standard deviation of Y.
   
   
2. Compute
   
3. Compute
   
   
4. Compute df = N - 2.
   
   
5. Find t for these df using a t table.
   
   
6. Lower limit = b - t s_b
   
   
7. Upper limit = b + t s_b
   
   
8. Lower limit ≤ population slope ≤ upper limit.

Next section: Introduction to multiple regression