Footnotes
Chapter 4: Probability
1 Statisticians often use upper case and lower case letters to distinguish between a random variable, which can take on different values, and the actual values that happen to occur. We use upper case notation for simplicity.
2 A discrete random variable can have an infinite number of possible values, for example, the number of times a coin is flipped before obtaining a heads. What matters is that the possible values can be counted.
Chapter 5: Sampling
1 A systematic random sample chooses one of the first k items in a population and then every kth item thereafter. If the population is not randomly arranged, but is in some sort of systematic order (for example, in alphabetical or chronological order), then each ...
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