Motivation
Who doesn’t want to do predictions?! Who doesn’t want to know the future?!
If you ask me,
“Olivia, if I am going to study 2 hours for the exam, can you predict what score I am going to get?”
Wouldn’t it be GREAT if I could give you the exact answer right away based on the exact information that you give me (2 hours of study)?
Unfortunately, so many factors are at play in real life that it is often very difficult to have accurate predictions based on just a handful of factors. Nonetheless, the inherent difficulties haven’t stopped statisticians from trying.
We will learn how to describe and summarize the relationship between two quantitative variables in Ch 4. Then in Ch 5, we will do simple statistical predictions. Ch 4 and Ch 5 are closely related.
Instructions
- There are altogether 3 problems in this lab work:
Note:
If the video requires that you use graphing paper for a certain problem, then you need to use graphing paper to receive full credits. You can use both a “physical” copy of a graphing paper or a “digital” copy of a graphing paper (see below). Either way, just scan your work as usual as one single PDF.
You can download free graphing paper of various grid sizes from the web. Then you can print it out and use it for your lab work. Here is the graphing paper of 0.25″ grid size: 0.25_inches
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- #4.2 (explanatory vs response variable)
- #4.27 a) (drawing a scatterplot and describing the relationship)
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- When you calculate the mean of x and mean of y, don’t round off too soon. Otherwise, your answer for the Extra-subpart won’t be accurate!
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- problem not in book (calculate r)
- The video explains the concepts and also shows you how to do the lab work:
Ch 4 Scatterplots & Correlation
- Submit your lab work as a PDF file to Canvas before the due date.
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