Find the size of each of two samples (assume that they are of equal size) needed to estimate the difference between the proportions of boys and girls under 10 years old who are afraid of spiders.

The size will be "431".

Step-by-step explanation:

On assuming:

P1 = 0.5

P2 = 0.5

Now,

and,

Margin's error will be,

E = 0.07

For 96% CI critical will be:

Z = 2.054

So,

Sample size =

On putting the estimated values, we get

                     =

                     =

                     =

                     = 431

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!

answer: the distance

step-by-step explanation:

to calculate the distance d of a line segment with endpoints (x1, y1) and (x2, y2) use the formula d (x2 x1)2 (y2 y1)2. to calculate the midpoint of a line segment with endpoints (x1, y1) and (x2, y2) use the formula