3. A political campaign manager wants to test the effectiveness of a new advertisement featuring Candidate X The campaign manager takes a random sample of 300 voters before the ad goes on air and another random
sample of 250 voters afterwards. 158 of the 300 voters in the "before" sample say they support Candidate X
and 140 voters in the “after” sample say they support Candidate X. If P,= the proportion of all voters who
support Candidate X after the ad is aired and Pe=the proportion of all voters who support Candidate X
before the ad is aired, which of the following is the correct standardized test statistic for H: P.-P. = 0?
0.56 -0.527
0.56 -0.527
(b)
10.56(0.44 0.527(0.473)
0.542(0.458) 0.542(0.458)
250
300
250
300
0.56 -0.527
0.56 -0.527
(c) == -
(d)
0.542(0.458)
0.56(0.44) 10.527(0.473)
550
250
300
0.56 -0.527
(e) ==
0.56 0.527
250 300

step-by-step explanation:

we are given a graph for system of inequalities.

in order to write the system of inequalities for the given graph, we need to find the inequality for each of the line separately.

let us find the slope of dotted line first.

taking two coordinates on the graph.

let us say (0,0) and (3,1).

let us find the slope of the line now.

slope of the dotted line would be =.

y-intercept of dotted line is y=0 only.

plugging slope m= and b=0 in slope-intercept form y=mx+b, we get

.

the line is shaded up of that dotted line.

therefore, for shading up we would take greater than inequality symbol > .

and because it's a dotted line we would take only > symbol in place of = sign in above equation of line.

therefore, inequality for dotted line would be

let us take two points (3,1) and (0,4) on the solid line.

slope of the solid line would be =.

for the solid line we have y-intercept b= 4.

plugging slope m= -1 and b=4 in slope-intercept form y=mx+b, we get

y = -1x + 4.

the line is shaded down of that solid line.

therefore, for shading down we would take less than inequality symbol < .

and because it's a solid line we would take ≤ symbol in place of = sign in above equation of line.

therefore, inequality for solid line would be

answer:

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21  

-7 + ? = 21

-7 + 28 = 21

hope it

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21

-7 + ? = 21

-7 + 28 = 21

hope it