Chapter 5B: Multiple Regression Using SPSS: Answers



Multiple Regression Using SPSS

A cancer specialist from the Los Angeles County General Hospital (LACGH) rated patient optimism in 20 to 40 year old patients with incurable cancer in 1970. In 1990, the researcher examined hospital records to gather the following:

- SES (1-7)

- Age in 1970

- Optimism in 1970 (1-100)

- Longevity (years lived after the 1970 diagnosis)

|1. |Do the IVs correlate statistically significantly and practically with the DV? |

|2. |Is collinearity a concern among the independent variables? |

|3. |What is the R and adjusted R Square for all IVs entered simultaneously? |

|4. |What variable(s) provide a significant unique contribution(s)? |

|5. |Compose a Results section for this statistical analysis. |

|1. |Do the IVs correlate statistically significantly and practically with the DV? |

| |YES! ALL THE IVS CORRELATE STATISTICALLY SIGNIFICANTLY (p < .05) AND PRACTICALLY (r > .3). |

|2. |Is collinearity a concern among the independent variables? |

| |NO CONCERN, THE TOLERANCE INDICES (I.E., THE PROPORTION OF AN INDEPENDENT VARIABLE'S VARIANCE NOT ACCOUNTED FOR BY OTHER |

| |INDEPENDENT VARIABLES IN THE EQUATION) ARE ALL GREATER THAN .2 - .3. |

|3. |What is the R and adjusted R Square for all IVs entered simultaneously? |

| |( .585 ) AND (33.4%), RESPECTIVELY. |

|4. |What variable(s) provide a significant unique contribution(s)? |

| |ONLY OPTINISM PROVIDES A UNIQUE CONTRIBUTION. |

|5. |Compose a Results section for this statistical analysis. |

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