4.7 CHAPTER EXERCISES Concept Questions Indicate true or false for the following statements. If false, specify what change will make the statement true. 1. 2. The t distribution is more dispersed than the normal. The x2 distribution is used for inferences on the mean when the variance is unknown. The mean of the t distribution is affected by the degrees of freedom. 3. 4. The quantity L (y-p) √02/n has the t distribution with (n - 1) degrees of freedom.