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In Modules 8 and 9, you will take a two-part final practical exam. In Part I, you will examine a set of sample data, formulate a hypothesis, determine the appropriate t-test to run, and determine the alpha (a) level. In Part II, after input on Part I from your instructor, you will run the test and interpret the results. Take some time now to think about the exam.

In Part I, you will evaluate an aircraft altimeter data sample from different companies to determine if there are any differences in error. You have the following three options for running the appropriate t-test.

  • Option 1 – compare one brand against a hypothesized mean to determine if the brand is statistically different than the assumed norm. In this case, you would have to cite where the hypothesized population mean came from.
  • Option 2 – compare one brand against another to see if there are significant differences between them.
  • Option 3 – compare either altimeter error of ACME or Brand X before adjustment and calibration and after adjustment and calibration to see if there are any differences in the means (performance).

Based on the type of dependent variable data (ratio) and the type of question in the scenario, you will use a t-test. As you know, there are three different types of t-tests you can use:

  • One sample t-test (test for one population mean using Excel)
  • Two sample t-test (hypothesis test for two population means using Excel)
  • Paired t-test (compare before and after values for one type using Excel)

Review the Module 8 – Final Practical Exam: Part I assignment now. It is due by the end of module week 8, but you can turn it in early and get feedback from your instructor.