- These are the type of questions you'll see on our unit test--so make sure you put in a solid effort on this homework! Clearly, it's great practice for our exam (as these are exam questions!)
- For 2008B part A, you need to find sample size (n), given the margin of error ("within 2 feet")
- What part of the interval formula represents the margin of error? Set this part of the formula = 2 (just like we did to find sample size given ME in the past!)
- It is impossible to look up t* without knowing n; so, when we find sample size, we must use z* (1.96 for this problem)
- Substitute 12 for sigma and 1.96 for t*, then do some algebra to solve the equation for n!
- Then, based on your answer, determine if you have enough $ in the budget for the required sample size (and write this down)!
- For 2008B part B, consider your answer above....what problems arise due to our budget constraints?
Good luck! And here are the answers so you can check your work...
2013 Scoring Guidelines (look for #1)
2008 Form B Scoring Guidelines (look for #3)
- Part C is not in the answer key....I added that part to the original question.
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