Author Question: In a family with 4 children, the number of children with blue eyes is a binomial random variable X ... (Read 168 times)

DyllonKazuo · **on:** Jul 24, 2018

In a family with 4 children, the number of children with blue eyes is a binomial random variable X with n = 4 and p = .20. What is the variance for the number of children with blue eyes, V(X)?

Question 2

Many people now-a-days use e-mail to communicate with family and friends and as a primary source of communication at their job. Is there a difference between the use of e-mail for men with a college education and those without? A survey in a large city reveals that out of 230 males with a college degree, 212 use e-mail more than twice a day. Out of the 150 without a college education, 122 use e-mail more than twice a day. What is the estimate for the difference between the proportions of men with and without a college degree who use e-mail often?