b
We have seen a few key graphs for your graph-making toolkit:
▪ barplot (one or two qualitative variable)
▪ histogram, etc. (one quantitative variable)
▪ scatter plot (two quantitative variables)
• Use basics to create more complex graphs:
▪ two qualitative variables
▪ one qualitative, one quantitative variable
▪ how relationship quantitative variables depends on a third, qualitative variabl
A z-score is the number of standard deviations a value is from the mean
Lecture notes Feb 4th
A graphical representation of a sample space and events is a Venn diagram,
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A trial is one repetition of a random experiment
A simple event can only be one number
-​ A composite event is any combination of two or more basic outcomes from a random
experiment
“Rolling an odd # less than 5 E -?” E - {1,3,} ( use curly brackets before listing events)
A device that can be helpful in identifying all possible outcomes of a random experiment, particularly one that can be viewed as proceeding in
stages, is what is called a tree diagram.
-​
The line segments are called branches of the tree. The right ending point of each branch is called a node. The nodes on
the extreme right are the final nodes; to each one there corresponds an outcome, as shown in the figure.
Substitution law is just the additive rule plus the case where the middle part = 0 ]