A multiple regression analysis produced the following tables: The sample size for this analysis is ___.
A)27
B)29
C)30
D)25
E)28

Question

A multiple regression analysis produced the following tables:   The sample size for this analysis is ___.
A)27 
B)29 
C)30 
D)25 
E)28

Quizplus · Accepted Answer

According to the first table, the degrees of freedom (DF) for the error term is 20, and the DF for the regression is 9. The formula for the total degrees of freedom (DFtotal) is DFtotal = DFerror + DFregression + 1 (for the intercept term). Substituting the values gives DFtotal = 20 + 9 + 1 = 30. Therefore, the sample size is equal to DFtotal plus 1, which is 31. However, one of the rows in the second table is labeled "Total" and includes all observations in the sample, which means that the actual sample size is one less than this value. Therefore, the sample size for this analysis is 30.

A Multiple Regression Analysis Produced the Following Tables