Lab 4 Answers

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1. Describe how you gathered your fourth sample.
2. What is the mean and sample standard deviation for the age of your sampled individuals in each of the four samples? What is the proportion of females in your four samples?
3. List the four 90% confidence intervals for the mean age of individuals in the study that you found. (Make sure you entered the confidence intervals in the Google Sheet.)
4. If all the confidence intervals overlapped, does that imply that the mean must be in that overlap?
5. What percentage of the confidence intervals generated by the class for this lab will fail to contain the population mean?
6. State your conclusion to each hypothesis test. (Make sure you enter the test stat and the conclusion into the Google Sheet.)
7. What is a Type I error? Of all the hypothesis tests done by this class for this lab, how many (percentage) will commit a Type I error?
8. How many of your hypothesis tests agree? If different samples gave you different hypothesis test results (i.e. some rejected the null hypothesis and some did not) does that mean your sampling design for the incorrect hypothesis test(s) was faulty?
9. Include the calculations for the four confidence intervals and your four hypothesis tests in full. Include the summary statistics for your four samples with details on how you gathered them.  
10. Make sure you enter in your sample summary statistics, confidence intervals, and hypothesis tests into the google sheet before the Lab due date:  google doc If you neglect this task, you will be docked 4 points.