In a study of cell phone use and brain hemispheric dominance, an internet survey was e-mailed to 2457 subjects randomly selected from an online group involved with ears. 935 surveys were returned. construct a 95% confidence interval for the proportion of returned surveys.

find the best point estimate of the population proportion p.

identify the value of the margin of error e.

construct the confidence intreval.

(0.1886,0.5724)

Step-by-step explanation:

Given that in a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2457 subjects randomly selected from an online group involved with ears. 935 surveys were returned.

Sample proportion of returned surveys =

Sample size n =2457

q =

Std error of proportion =

a)  the best point estimate of the population proportion p.=0.3805

b) Margin of error = 1.96* std error =

c) Confidence interval =

answer: the price of one pound cabbage = $ 0.8

the point (10,8) represents that the cost of 10 pounds cabbage is $ 8

step-by-step explanation:

since, here is a proportional relation between the number of pounds of cabbage (x) and the price in dollars (y).

therefore, we can write,

⇒ y = k x

where k is the constant of proportionality.

now, point (5,4) is in the line.

thus, it will satisfies the above equation of line.

⇒ 4 = 5 k

⇒ k = 0.8

thus, the equation of the line is,

y = 0.8 x

a) for x = 1,

y = 0.8

therefore, the cost of one pound of cabbage is 0.8 dollars.

b) in the below graph (10,8) represents that the cost of 10 pounds of cabbage is 8 dollars.

add an image

step-by-step explanation: