37. Calculating Degrees of Freedom How is the number of degrees of freedom for Exercises 19 and 20 affected if Formula 9-1 is used instead of selecting the smaller of n1 – 1 and n2 – 1? If Formula 9-1 is used for the number of degrees of freedom instead of the smaller of n1 – 1 and n2 – 1, how are the P-value and the width of the confidence interval affected? In what sense is “df
smaller of n1 – 1 and n2 – 1” a more conservative estimate of the number of degrees of freedom than the estimate obtained with Formula 9-1?