Here's a breakdown of what's on our test:
- Create a confidence interval given a context
- Remember to check conditions!
- Show the math--show the formula with values substituted, then find the interval on your calculator!
- Interpret the interval!
- Know how confidence level affects the ME and width of an interval
- Know how sample size affects the ME and width of an interval
- Find sample size (n) given ME
- Find ME given a confidence interval
- Find ME given p-hat, n, and a confidence level
- Determine the value of p-hat given only an interval
- Use a confidence interval to determine if it supports a claim (check to see if some value falls within our interval or not!)
- Explain the meaning of ___% confidence--interpret the confidence LEVEL
- Be careful of mixing up interpreting the level vs. interpreting the interval!
- Find the confidence level given n, p-hat, and ME (set up an equation and solve for z*, then use this to determine what the confidence level was!)
- Know the relationship between n and ME...
- If we increase our sample size by multiplying by 16, ME (and st. dev.) are only divided by 4!
- If we want to cut ME by 1/3 (divide it by 3), we need a sample size 9 times as large!
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