What is the relationship between the labor participation rate and the unemployment rate?

After reading chapters 8, 9, and 10, (refer to pasted link for online book) write a 2-page paper describing how the published unemployment rate is derived.
What is the relationship between the labor participation rate and the unemployment rate?
How can the published unemployment rate actually be misleading vis-a-vis economic conditions?

Follow the link below to online book and please navigate to page 158 to skip to Chapter 8 and read on from there for reference: 

https://books.google.com/books?id=X8a5DQAAQBAJ&pg=PR1&lpg=PR1&dq=macroeconomics+gwartney+16E+chapter+8&source=bl&ots=u2GubT3RiK&sig=RZD63aCEx-TLbjz90I77tN1pWE4&hl=en&sa=X&ved=2ahUKEwiSj4TV997cAhXumq0KHa2uD7cQ6AEwCXoECAEQAQ#v=onepage&q&f=false

Note: Some pages might not be available online. If so and if needed, please contact me and I will provide jpeg copies of those pages. 

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