Here's what you should know (really just everything about t-tests and intervals):
- How to conduct a full t-test or t-interval
- Test: Hypotheses, Conditions, Math, Conclusion
- Interval: Conditions, Math, Interpret Interval
- Be sure you know how to show the t-interval formula, including being able to find t* from the t-table based on degrees of freedom (df = n -1)
- Know how to calculate margin of error given sample data (including finding t* from the t-table)
- Know when we would use a z-test for means v. a t-test for means
- Z Test for Means: if we know the population standard deviation (sigma)
- T Test for Means: if we do not now the population standard deviation (we only know the sample standard deviation, Sx)
- Know the characteristics of the t-distribution
- Shape
- How does df (and thus, sample size) affect the shape of a t-distribution?
- Which has more variance/variability--Normal model or t?
- Find sample size for a given margin of error
- Remember to use z* with these types of problems--we can't find t* without n, and the point of this question is to find n
- Like 2008B part a (Thurs. HW) OR like the "download times" slide in our notes
- Know how to find margin of error and a point estimate (sample statistic) given only a confidence interval
Want to study and get some extra credit? Check out (and do) these problems in the textbook:
Pages 542-546: 9b, 11, 13acd, 21bc, 31 (full test)
Today's Class Recap:
- Stamp = Probability Review!
- HW Q's?
- April Break: TAKE HOME TEST = AP EXAM PREP!
- Passed out test (MC and FR)
- Sign up sheet for April break review session went around
- Discussed importance of AP exam prep
- New stuff = ch. 25
- What does "statistically significant" mean?
- What is "paired data?"
- What are some examples of when/where we would pair data?
- How is a paired t test/interval different from a 2 sample t-test/interval?
- Tomorrow we'll start to do the math and actually conduct a paired t-test and create a paired t-interval
Friday = Ch. 23 and 25 Vocab Quiz! Start studying!
- Statistically Significant
- Paired Data/Matched Pairs
- Mean Difference v. Difference in Means
- T Distribution
- Shape
- How does df affect shape
- Degrees of Freedom (how are they calculated)?
- All vocabulary terms from our test last week are free game--study those definitions!
- Confidence Interval
- Hypothesis Test
- Critical Value
- Standard Error
- Margin of Error
- Point Estimate
- Ho
- Ha
- Confidence Level
- (Standardized) Test Statistic
- P Value
- Alpha Level
- Beta
- Type 1 Error
- Type 2 Error
- Power
- Sampling Variability
- One v. Two Tailed Test
- Reject Null = there IS evidence of Ha
- Fail to Reject = there IS NOT evidence of Ha
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