A school librarian purchases a novel for her library. The publisher claims that the book is written
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A school librarian purchases a novel for her library. The publisher claims that the book is written at a fifth-grade reading level, but the librarian suspects that the reading level is lower than that. The librarian selects a random sample of 40 pages and uses a standard readability test to assess the reading level of each page. The mean reading level of these pages is 4.8 with a standard deviation of 0.8. Do these data give convincing evidence at the a=0.05 significance level that the average reading level of this novel is less than 5?
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