For a given confidence level tdf is larger than z Explain ho

For a given confidence level, t_df^* is larger than z*. Explain how t_df^* being slightly larger than z* affects the width of the confidence interval. ^35Fnelecomy.gov, Shared MPG Estimates: Toyota Prius 2012.

Solution

A slightly larger t* df than z* affects the width of the confidence interval as CI with z* involves population standard deviation and t* involves sample standard deviation.

Also the atble values changes for t*df and z*