Stat 217
Lab 3

1: Background 2: Files Needed 3: Data Collection 4: Explore Data 5: Thought Questions 6: Inference 7: Simulation 8: Discussion 9: Conclusions 10: Applications 11: Summary

Inference - Confidence Intervals

Let represent the population mean number of minutes after the start of the party for all UC Davis students.

(d) Is a parameter or a statistic? Explain.

 

(e) To calculate a confidence interval for a population mean, the simplest formula is + 2 /.

1. Explain what represents here.
2. Explain what / measures here.

Unfortunately, we don't usually know , so we will again use s/ as the "standard error of the sample mean."

(f) Calculate the standard error for this sample.

 

(g) Use the standard error and the 2SD short-cut to approximate a confidence interval for the population mean. Interpret this interval in context.