Confidence Intervals (Parts of 10.1, 11.1, 12.1)
Outline
AP Statistics
Mrs. Harrison
Essential Questions:
1. How is inferential statistics different from descriptive statistics?
2. How is margin of error related to statistical confidence?
3. What happens to margin of error as sample size increases or decreases?
4. What kinds of errors are taken into account in a margin of error?
5. Under what conditions should you use t-procedures?
6. What conditions are necessary to fulfill in order to do inference on proportions?
7. Where can you find formulas for standard errors on your formula chart?
Knowledge: You should be able to define, illustrate, or calculate the following:
 Statistical inference
 Sample proportion
 Statistical confidence
 Standard error of 𝑝̂
 Margin of Error
 Z-procedures for
proportions
 Confidence Interval
 p*
 Confidence Level
 Standard error
 Critical Value (z*)
Skills:
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T distribution
One-sample t-statistic
Degrees of freedom
Robustness
You should be able to…
Understand the margin of error and how it relates to confidence intervals
Be able to choose a sample size for a desired margin of error and confidence level
Remember the necessary conditions for inference about proportions
Compute a confidence interval for a population proportion
Build confidence intervals for a population mean using t-procedures
State or calculate conditions, degrees of freedom, and standard error for t-procedures
Calendar:
6
10.1 Intro to
Inference/Confidence
Intervals
13
12.1 Inference for a
Population Proportion
9
10
Continue 10.1 Confidence Continue 10.1 Confidence
Intervals
Intervals
10.1 Quiz
16
17
12.1 Cont.
President’s Day
Practice Worksheet
11/12
11.1 Inference for the
Mean of a Population
20/21
Confidence Interval
Practice
22
25
Confidence Intervals
Review
27/28
29
26
Confidence Interval Test
11.1 & 12.1 Quiz