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, The average time a book is kept is different from 3 weeks, or the average time a book is kept is longer than 3 weeks.   What is the null hypotheis? -The average time a book is kept is 3 weeks, The average time a book is kept is different from 3 weeks, or the average time a book is kept is longer than 3 weeks.

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