# Why there are two different results?

I found my four independent variables have a high positive association with my depepednet variable. However, except one independent variable, P value of all other indepdent variables are not significant in my regressino analysis. My hypothesis is that each of my independent variables separately has a postive relationship with my dependent variable, so I have four hypothese. I was wondering if I should reject three of my hypothese under such situation? Sorry, forgot to say, There is no collinearity problem with my independent varibales Thank you.

More information:Please see attached picture. It is my research model. After bivariate correlation analysis and partial correlation, all independent variables are positively associated with dependent variable. A hierarchical regression was used with control variable.I first put control variable in first block of SPSS, and then add the 4 other independent variables in second block. The results are in attached docuement. Three independent variables are not significant.... Correlation table:

• Correlation does not mean causation. See this cute graph for an example: chocolate consumption vs nobel prize. Also you should consider correcting for multiple testing Aug 8, 2014 at 11:44
• Provide some more information. At least (a) how you did the regression analysis and concluded that all but one independent variable was not significant (b) how you concluded that there is no collinearity problem with your independent variables. Aug 8, 2014 at 13:54
• @whuber. I'm not sure this is a duplicate of "How can adding a 2nd IV make the 1st IV significant?". The OP hasn't given much information but he seems to be saying that adding the 2nd IV makes the 1st IV less significant, when there is no collinearity of the IVs. I don't understand how that could happen, hence my request for confirmation that it did happen. Aug 8, 2014 at 14:44
• I should perhaps mention that the title is literally a duplication of stats.stackexchange.com/questions/33888/… Aug 8, 2014 at 15:59
• @user20637 Thank you for pointing that out--I was sure this question had been asked and answered but I mistakenly identified the wrong one in a search. Being unable to find the duplicate I remember, I will reopen this one.
– whuber
Aug 8, 2014 at 16:07