An employee at an animal hospital is keeping track of all of the dogs that are currently in-house and whether they have received their shots. She decides to record all dogs with brown hair first. Identify the type of sample described.

Options:

self selected

systematic

stratified

cluster

convenience

Stratified

Explanation:

In stratified sampling, a population is divided into subgroups or strata, based on peculiar characteristics or attributes that is shared by all members put into that strata. In other words, members in a strata are placed together based on specific and distinctive attributes that defer from other members of another strata.

In the case of the employee working at an animal hospital, the sample described in the question that she uses can be said to be stratified, as dogs with brown hair are placed in a strata.

(0,-3) see attached graph

step-by-step explanation:

a. to solve the system, graph the two equations.

x = y+3 becomes y=x-3 has m=1/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move up 1 unit and 1 unit to the right. plot a point and connect.

y=-4x+3 has m =-4/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move down four units and to the right 1 unit. plot a point and connect.

the solution is the point (x,y) where the two lines intersect. by the graph below it is (0,-3).

b. to solve by substitution, substitute y = -4x-3 into x= y+3

x= (-4x-3) +3

x=-4x

5x=0

x=0

now substitute x = 0 back in to find y.

y= -4(0)-3

y=0-3

y=-3

solution is (0,-3)

c. use elimination by adding the equations together.

x-y=3

4x+y=-3

5x=0

x=0

then substitute into one equation to find y.

y=-4(0)-3

y=-3

yes

step-by-step explanation: