Testing Hypothesis Using Regression Model And R-Square Tests


Using the ustudy.sav file, the following hypothesis will be tested:

H1: The likelihood of a faculty being in a public or a private university is predicted by the number of years since they got their doctorate and their salary.

 Dependent variable:

  • UNIV (type of university) = dependent binary variable (if the dependent variable has more than two levels, a multinomial logistic regression must be used instead of the binary one)

Independent variables:

  • YRSPHD (years since PhD) = independent variable with ratio data
  • SALARY (salary) = independent variable with ratio data

Note: Categorical variables (with nominal or ordinal data) can be included in the regression model. If such categorical predictors exist, they must be declared as Categorical in the SPSS Logistic Regression window. SPSS will dummy-code these variables automatically.


To test the predictive model, a binary logistic regression will be performed as follows:

  • select ANALYZE / REGRESSION / BINARY LOGISTIC.. from the menu;
  • move UNIV in the Dependent area and variables YRSPHD and SALARY in the Covariates area; make sure "Enter" is selected under Method;
  • click OK.
  1. EXERCISE. Answer the following questions:
  1. What are the most important differences between linear multiple regression and binary/multinomial logistic regression?
  2. Is the regression model significant? Explain. (Check the chi-square df, and p of the model in the Omnibus Tests of Model Coefficients)
  3. What are the “R-square” values and how do you interpret it? (See the Model Summary section of the SPSS output.)
  4. Explain the difference between the Cox & Snell and the Nagelkerke R-square indicators. (see Hair & al.)
  5. What is the interpretation of the -2 Log likelihood value?
  6. Are the predictors statistically significant? Explain. (See the Variables in the Equation table.)
  7. Why are Wald tests used to answer #5 above and not t-tests like in multiple regression?



The question belongs to Statistics and it discusses about validating or testing a hypothesis using various tests such as regression model, R-square and multiple regression tests.

Total Word Count 1099

Download Full Solution


  • HWA

    this is a very good website

  • HWA

    I have 50 questions for the same test your page is showing only 28

  • HWA

    hi can you please help or guide me to answer my assignments. thanks

  • HWA

    hi can anyone help or guide me to my assignments. thanks

  • HWA

  • HWA

    This solution is perfect ...thanks

  • HWA

    Hello Allison,I love the 2nd image that you did! I also, had never heard of SumoPaint, is something that I will have to exolpre a bit! I understand completely the 52 (or so) youtube videos that you probably watched. Sometimes they have what you want, sometimes they don't! However, it is always satisfying when you are able to produce something that you have taught yourself. Great job!Debra 0 likes

  • HWA

    Perfect bank of solution. 

  • HWA

    great !

  • HWA
    Paul Brandon-Fritzius

    thanks for the quick response. the solution looks good. :)

  • HWA
    tina Johnson

    thnx for the answer. it was perfect. just the way i wanted it. 

  • HWA

    works fine.