why t distribution for variance why do we need the t distribution in confidence level why t distribution in confidence level for mean why t distribution in confidence level why does mean follow t distribution why is the t distribution important in determining confidence level in a sample mean why is there a t distribution in confidence level why is the t distribution in the mean? what would mean t distribution and confidence level why t distribution is needed for confidence level why if confidence level is higher than the mean the t distribution should follow if a sample means is normally distributed, why does the t distribution come in why t distributions in confidence level when does the t distribution come in confidence level if the mean is unkown then why is there a t distribution what is t distribution in confidence level why is t distribution necessary in confidence levels why are t distributions useful why t distribution in confidence level why t distribution