3/25/2013

Discussion of simulation activity / Interpreting confidence intervals

• 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?

A modified approach for small samples

• An exact confidence interval
• A slight modification to the large sample procedure

Class Exercises

• 9.31, 9.41, 9.43, 9.47

Please complete your reading of Chapter 9 and read Section 10.1 for class on Wednesday.