At the local college, a study found that students earned an average of 9.1 credit hours per semester. a sample of 96 students was taken. what is the best point estimate for the average number of credit hours per semester for all students at the local college?

9.1 credit hours per semester.

Step-by-step explanation:

Given : At the local college, by taking a sample of 96 students , study found that students earned an average of 9.1 credit hours per semester.

i.e. credit hours per semester.

Then, the best point estimate for the average number of credit hours per semester for all students at the local college should be sample mean

i.e. credit hours per semester.

(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

step-by-step explanation: