ABSTRACT

The probability of an event is then the frequency of all (hypothetical) realizations that satisfy the property stated in the event. This chapter shows that the probability of caffeine content in a randomly chosen cup of coffee is the same as the frequency of such cups in the entire population of all possible cups of coffee. The sample mean is a quantity that can be computed after observing the data. Any such quantity is called a statistic. Values of a variable in a population are modeled by random variables. Statistical inference will be based on the probabilistic properties of an appropriate summary of data. The chapter also includes some exercise problems related to the concept of probability.