how to estimate a regression model confidence intervals which model is used only when the true relationship is unknown? hat x hat x why is it necessary to do logistic regression what is the confidence interval of the linear regression what is the confidence interval for a linear regression test is a confidence interval a linear function which statement best describes the relationship between confidence intervals in linear regression does more variables mean tighter confidence intervals does more variables mean tighter confidence intervals? do more variables mean tighter confidence intervals in regression what is the confidence interval between variables which is true about the confidence interval in a linear regression model? how to get confidence interval for a regression model how to calculate confidence intervals how to predict confidence interval on regression model if the confidence interval is tighter, why is the relationship of $y and $x? what is the confidence interval of the model what does the confidence interval do for a confidence interval what is the confidence interval for using a regression model