Simulating variance of sum of two binomial variables
In the last multiple choice exercise, you examined the expected value of the sum of two binomials. Here you'll estimate the variance.
Cet exercice fait partie du cours
Foundations of Probability in R
Instructions
- Use your simulation of the variables X and Y to estimate the variance of
X + Y. - Use your simulation to estimate the variance of
3 * X + Y.
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
# Simulation from last exercise of 100,000 draws from X and Y
X <- rbinom(100000, 20, .3)
Y <- rbinom(100000, 40, .1)
# Find the variance of X + Y
# Find the variance of 3 * X + Y