Suppose that independent random samples of size n from two normal populations with the known variances σ₁² and σ₂² are to be used to test the null hypothesis μ₁ - μ₂ = δ₀ against the alternative hypothesis μ₁ - μ₂ = δₐ. Suppose further that the probabilities of type I and type II errors are to have the preassigned values α and β.
Show that the required size of the sample is given by

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !

the probability that a bird is green (.30) is true

step-by-step explanation:

what the heck is this   i am in the 2 grade my g and i is verrr smert

step-by-step explanation: