Analysis of Regression Results; Appendix (Continuation of 8-36) The following table shows additional regression results presented by the researchers in the study described in Exercise 8-36. There are two regressions. The right-hand column shows the results for all patients, including those treated with laparoscopic surgery. The left-hand column shows the results for the sample of patients who were treated without the laparoscopic surgery, and the related costs.
| Not Laparoscopic | All Patients |
Coefficients for independent variables |
|
|
Regression intercept | $ 8,043 | $ 3,719 |
Length of stay |
|
|
Coefficient* | Not significant | 861 |
Standard error for the coefficient | Not applicable | 80 |
Number of complications |
|
|
Coefficient | 3,393 | 1,986 |
Standard error for the coefficient | 1,239 | 406 |
Laparascopic |
|
|
Coefficient | Not applicable | 908 |
Standard error for the coefficient | Not applicable | 358 |
ff-squared | 0.11 | 0.53 |
* Note: All independent variables are significant at the level of p = .05 (and t-value >2) except for the length of stay variable in the nonlaparo scopic condition.
Required
1. Which of the two regressions has the better reliability and precision in estimating cost? Why?
2. Interpret the values of each coefficient and the standard error for each coefficient.
3. What are the t-values for each of the independent variables for each regression?
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