Which of the following changes in sample size and degrees of freedom, respectively, is most likely to result in an increase in the width of the confidence interval for the population mean? Sample size Degrees of freedom A)Increase Increase B.Increase Decrease C.Decrease Increase D.Decrease Decrease answer is D. can nyone explain y CI width will be more when we have low degrees of freedom? thnx
Well…lowering sample size also lowers dof. A lower sample size creates less confidence that your sample accurately represents the population, so…confidence interval widens.