6.1.1: Identifying null and alternative hypotheses. qx3zqy7 Jump to level 1 A librarian believes that most books are kept longer or shorter than the allowed time of 3 weeks. What is the alternative hypothesis? The average time a book is kept is 3 weeks. Pick What The average time a book is kept is 3 weeks. The average time a book is kept is different from 3 weeks. The average time a book is kept is longer than 3 weeks. Check Try adam