**The answer key/rubric for #4b is pretty confusing...check it out...
- 4b asks us why "this distinction--whether the songs were selected with our without replacement--is not important for the construction of the interval." Consider this--whether the songs were selected with or without replacement relates to independence; for instance, if songs are selected without replacement, we can't hear a song after it's played--so the probability we hear "The Weather" by Luke Christopher next depends on what was played previously...
- What condition do we check that allows us to assume independence within our sample? (10% condition!)
- So, this distinction is not important, because our sample of 50 songs is less than 10% of all 2,384 songs on the player!
The more effort you put into this homework the more you're studying for tomorrow's quiz!
Tomorrow's quiz (ch. 19):
- 2 open ended
- One open ended is just like #4a from tonight's homework!
- 3 MC
- And here's the content that might show up on your quiz--so know this stuff!
- Find margin of error
- Find sample size
- Find confidence level (like #37 from our textbook hw)
- Find the point estimate (p-hat) and/or margin of error given an interval (stuff Mr. Mason sent us)
- Interpret confidence level
- Estimate a proportion = create an interval (conditions, math, interpret interval)
- Use a confidence interval to support/reject a claim
2010 Scoring Rubric (scroll to #3)
2010 Form B Scoring Rubric (scroll down to #4)
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