Lesson 11

Part III (Introduction to Statistics, continued)

In this part, we will work with the Statistics Wizard. The wizard is very useful for studying tests, intervals and distributions.

1. Where is the Statistics Wizard?

2. Using the Statistics Wizard to Explore

3. Exploring by Editing Data (continued from #2)

Part III


Practice Exercises

  1. Assume that chicken eggs are normally distributed with a population mean μ (called “mu”) of 60g and a standard deviation δ (called “sigma”) of 4g.
  2. A farmer gives you a sample of 5 eggs (n=5). You decide to try a few statistical tests on the eggs.
  3. First, you find the average weight of the sample eggs. The average weight, called the sample mean or x-bar, is 63g.
  4. Open the Statistics application and select Calc/Test.
  5. For Type Test, select One-Sample ZTest.
  6. Select Variable (not List).
  7. Click Next.
  8. For the condition select greater than (>).
  9. Input the required information. Hint: Open Help and click in each field to figure out which values go where.
  10. Get a screen capture. Paste it into your Lesson 11 document (under a title of PART III).
  11. Click Next.
  12. Click the button. With your data results and graph showing, get a screen capture. Add two blank spaces following the last screen capture and then paste this one.

*What does the data mean?

One way to think about the result is this: If the μ condition is true (the mean weight is 60g) then there is about a 4.7% chance that we will obtain a sample of 5 eggs with an average weight that is 63g (x-bar) or greater.

  1. Click Back.
  2. Change the μ condition to less than (<).
  3. Click Next.
  4. Click the button.
  5. With your data results and graph showing, get a screen capture. Add two blank spaces following the last screen capture and then paste this one.

*In this case, if the μ condition is true (the mean weight is 60g) then there is about a 95.3% chance that we will obtain a sample of 5 eggs with an average weight that is 63g (x-bar) or less. Hey, this makes sense!

Part IV

Reflection Exercises

You have just completed the eleventh lesson in ClassPad 101. I hope you enjoyed learning about Statistics. Please take a few moments to copy and paste the following four questions at the end of your Lesson11 document and answer them.

  1. Approximately how long did it take you to complete this lesson?
  2. Which activity did you find particularly useful?
  3. Did you find any part of this activity difficult to follow? If so, which part? Also, how did you overcome the difficulty?

Assessment 11: Introduction to Statistics