Arandom sample of 205 college students was asked if they believe that places could be haunted, and 65 responded yes. estimate the true proportion of college students who believe in the possibility of haunted places with 99 % confidence.

The 99% confidence interval is given below:

Where:

is the critical value at 0.01 significance level

        rounded to two decimal places

Therefore, the estimate of the true proportion of college students who believe in the possibility of haunted places with 99% confidence is (0.23,0.40).          

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.