The worldwide market share for a web browser was 20.3% in a recent month. suppose that a sample of 120 random students at a certain university finds that 30 use the browser. complete parts (a) through (d) below. a. at the 0.05 level of significance, is there evidence that the market share for the web browser at the university is greater than the worldwide market share of 20.3%?

Step-by-step explanation:

Given that P = population proportion for the worldwide market share for a web browser was 20.3% in a recent month.

Sample size n =120 and sample proportion p = 30/120 = 0.25=25%

p difference = 0.203-0.25 = -0.047

(Right tailed test at 5% level)

Std error =

Test statistic Z = p diff/std error = 1.28

Since 1.28 lies in the range |z|<1.96, at 95% level we accept null hypothesis

There is  evidence that the market share for the web browser at the university is greater than the worldwide market share of 20.3%

i would need to see the dot plot : )

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