Exercises 110, solve the system by the method of substitution. x y 3x y2 1

Stat Notes Week 12 Sampling distributions - You get a statistic and treat it as a random variable - Distribution of a statistic treated as a random variable - Sample mean X is approximately normal μ =μ X - σ X 1/ n √ - ⋀ P is scaled binomial μ ⋀P - nP=x in binomial - σ = P(1 − P)/n ⋀P √ Estimation - When we use a statistic to approximate the value of a population parameter - What makes a good estimator - Accuracy- the ability to hit the center or around the target on average - Precision- the ability to hit in a group/ be in one area and recreate the same two shots- low vari