1. Homework
Pg. 481:
#20: What is violated? Random condition. Not a random sample from the population, cannot make inferences about the population
#26: Need to complete all sections

2. Unit 8: Estimating with Confidence
Use a confidence interval to estimate a population mean

3. Verify conditions of RIN
Objective(s):
Verify conditions of RIN
Construct and interpret a confidence interval for a population mean
Determine sample size necessary for a fixed ME
Emphasize the appearance of “and confidence interval” b\c there is a huge difference between the two parts of this objective.
Let students know that the conditions required to use a ConfInt should be familiar.

6. pt.est. ± (CritVal) • (Stdev of statistic)
To calculate a 95% confidence interval for µ , we use the familiar formula:
pt.est. ± (CritVal) • (Stdev of statistic)

7. One-Samp z Int for a Pop Mean
Choose an SRS of size n from a population having unknown mean µ and known standard deviation σ. As long as the conditions are met, a level C confidence interval for µ is