3/22/2013
Discussion of in class Exercises
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.
- Example - Exercise 9.15 on p. 428
Class Exercises
- The behavior of C.I.'s
- Simulate the drawing of 50 simple random samples of size 100 from a population with p = 0.6.
- Use Minitab to calculate the 90% C.I. for the population proportion for each of your 50 samples.
- Verify the caclulations by checking the interval given for the first sample.
- How many of your 50 C.I.'s contain the true mean?
- How does this simulation exercise help you interpret confidence intervals?
- 9.17, 9.25, and 9.29
Please read Chapter 9 for class on Monday.
Reminder: Our 2nd quiz will be on Monday! (See p:\data\math\hartlaub\elements of statistics for a sample quiz)