Variance of sum and difference of random ... - Khan Academy
Random variables can be any outcomes from some chance process, like how many heads will occur in a series of 20 flips. More specifically, an indicator variable We calculate probabilities of random variables and calculate expected value for different types of random variables. A random variable is some outcome from a chance process, like how many heads will occur in a series of 20 flips (a discrete random variable), or how many seconds it took someone to read this sentence (a continuous random variable). 3.6 Indicator Random Variables, and Their Means and Variances Definition 5 A random variable that has the value 1 or 0, according to whether a specified event occurs or not is called an indicator random variable for that event. They indicate (hence the name) whether a subject belongs to a specific category or not. Alexander Katz, Christopher Williams, and Jimin Khim contributed An indicator variable is a random variable that takes the value 1 for some desired outcome and the value 0 for all other outcomes. Random variables | AP®︎ Statistics | Math | Khan Academy. You’ll often see later in this book that the notion of an indicator random variable is a very handy device in Sal breaks down how to create the probability distribution of the number of "heads" after 3 flips of a fair coin. We calculate probabilities of random variables, calculate expected value, and look what happens when we transform and combine random …