An educator wishes to estimate the mean number of hours u that ten year old children in a certain city watch television per day. how large a sample is required if the educator wants to estimate μ within 0.5 hours with 95% confidence? assume σ 1.5
(a) 5.0
(b) 34.6
(c) 35.0
(d) 25.0

  (c) 35.0

Step-by-step explanation:

We are given that ,

Margin of error : E= 0.5 hours

Standard deviation:

Confidence level : 95%

We know that the z-value for 92% confidence level is 1.96.

Now, the formula to find the sample size is given by :-

Substitute all the value in this formula , we get

[Rounded to the next whole number.]

Thus , the minimum sample size = 35.0

Hence the correct answer is option (c) 35.0

hi,

i'm 75% sure the answer is 1,1 to both lines.

have a great day

answer: ratio of volume of cone (with 3 times the height and equal diameter) to volume of cylinder is 2 to 1. the value of π is not used.

step-by-step explanation:

radius is diameter/2 = 4.

area of circle is π r^2.

volume of cylinder is height × area of base = hπr^2 = 3(4^2) π = 48π cubic inches.

not knowing the formula for volume of cone, i calculate it using calculus (which is for calculating things).

volume of cone is integral 0 to h area(y) dy. area(y) is π r(y)^2. r(y) runs r to zero as y runs zero to h, r(0) = r, r(h) = 0.

r(y) = r - r/h y

area(y) = π (r - r/h y)^2 = π (r^2 - 2r^2y/h + r^2y^2/h^2) = π r^2(1-2y/h+y^2/h^2)

antiderivative area(y) = π r^2 (y-y^2/h+y^3/(3h^2))

integral 0 to h = π r^2(h-h^2/h+h^3/(3h^2) - (0)) = π r^2(h - h + h/3) = π r^2(h/3) = π/3 r^2 h

volume of this cone is π/3(4^2)18 cubic inches.

= 6 16 π = 96π cubic inches.

cone has twice the volume, 96/48.

cone height is 6 times the cylinder.

ratio of volume formula: π r^2 cancels.

cone over cylinder ratio is 6h/3 to h, 2 to 1.