We all know that the multiple linear regression model is set up (assuming using R language), behind each regression coefficient have corresponding p values are not, but the p value is not only if the hypothesis test is used, and hypothesis testing also only if the involved samples are used, but if a company, opened three years collapsed, you want to use the linear regression analysis and then the boss of this company this three years of sales, so take all three years of sales data to do the analysis, this case to get all the data, is the overall right, there is no samples, sample is not involved!!! I've got all the overall data still doing hypothesis test!!!!!! So could you please tell me when do the regression analysis, what p values on behalf of,,, I have is the overall, and hypothesis testing stem what ah,,, since no hypothesis test, why there are p value,,, a little fan!