We will continue with Ch 15 today.
At beginning of the video, we introduce the “big picture” type of issues that will become the focus of the 2nd part of the course, statistical inference (Ch 16, 17, 20 and 21). If you find that a bit abstract, don’t worry. We will go over those issues again.
The most important thing to learn today is to calculate probabilities regarding sample means. The techniques will be useful for the rest of the course.
Now, the techniques in this chapter are similar to those in Ch 3 , which makes it somewhat easier to learn. However, this similarity also causes confusion for many students. Just remember this — Ch 3 is about individual observations \( x \) while Ch 15 is about sample means \( \overline{x} \).
Instructions
- There is one problem in this lab work — this lab work question is exactly the same in both the 8th and the 9th edition. The only difference is the question number:
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- In the 8th edition, it is #15.31 (In the 9th edition, it is #15.33).
- The video explains the concept and shows you how to do the lab work:
- Submit your lab work as one single PDF file to Canvas before the due date.
That’s all for today’s lab work.
For Ch 15 multiple choice questions
The following video is for Ch 15 multiple choice questions. You don’t need the video below for your lab work today.
Ch15 mean and SD in different contexts
Several multiple choice homework questions in Ch 15 ask you to differentiate between the three different standard deviations:
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- population standard deviation
- sample standard deviation
- standard deviation of the sampling distribution of the sample mean
The video helps to explain all this.
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