9/28/2016
Questions on the sampling distribution of the sample mean
Statistical Inference
- Point Estimation
- Confidence Intervals: point estimator ± margin of error
Definition: A 100*C% confidence interval (C.I.) for a parameter (say theta) is given by two statistics L and U such that P(L<= theta <= U) = C.
- Derivation of a CI for mu
- Computing CIs with R - see zCI.R
Class Activity to understand computation and behavior of CIs
- The behavior of C.I.'s
- Use zCI.R to compute a CI for mu.
- Does the CI from your simulated data contain mu?
- Verify the caclulations by checking the interval given for the first sample.
- How many of the C.I.'s for the class contain the true mean?
- How does this simulation exercise help you interpret confidence intervals?
Complete the Confidence Intervals Lab on openintro.org
Please read Sections 4.3 - 4.5 for class on Friday.