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We will continue with Ch 13 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 14, 17 and 18). 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. This technique will be useful for the rest of the course.

Now, the techniques in Ch 13 are similar to those in Ch 11 , which makes it somewhat easier to learn. However, this similarity also causes confusion for many students. Just remember this — Ch 11 is about individual observations \( x \) while Ch 13 is about sample means \( \overline{x} \).

 

Instructions

• There is one problem in this lab work:

• • #13.36
    • a) and b)
    • an additional problem c) shown in the video

 

• The video explains the concept and shows you how to do the lab work:

Ch 13 cont’d

• 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 13 multiple choice questions

The following video is for Ch 13 multiple choice questions. You don’t need the video below for your lab work today.

Ch13 mean and SD in different contexts

Several multiple choice homework questions in Ch 13 ask you to differentiate between the three different standard deviations:

• • population standard deviation
  • sample standard deviation
  • standard deviation of the sampling distribution of the sample mean

The video explains all this.

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