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

step-by-step explanation:

kjswgdkxg

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb