What percentage of the books is green

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Reference no: EM13701591

Question 1: Webster Library wants to know how many green books it has. Out of the 500 shelves of books, 3 shelves were selected. These shelves hold 150 books each. 54 of the books sampled were green.

Part 1: What percentage of the books is green?

Part 2: What is the 90% confidence interval for the percentage of green books?

Part 3: How many books need to be sampled to be within 4% with 95% confidence?

Question 2: 35 books were sampled at the bookstore. They had an average price of $160 with a standard deviation of $43.

Part 1: What is the 95% confidence interval for the average price of a book?

Part 2: How many books need to be checked to be 90% confident that the average price was within $10?

Solve these questions in details and provide examples to support your rationale.

Reference no: EM13701591

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