Answer:
Pls don't report me because I need some points :>
Answer:
ac
Step-by-step explanation:
i think the answer is ac
Answer:
50
Step-by-step explanation:
all triangles equal a total of 180 degrees
so add 40+90
130 subtract
180-130 = 50
Answer:
a) 2.66
b) 9
Step-by-step explanation:
Central Limit Theorem
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean
and standard deviation
, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean
and standard deviation
.
part A: what is the standard deviation of the sampling distribution of x hat? show your work.
We have that
. So
![s = \frac{\sigma}{\sqrt{n}} = \frac{8.4}{\sqrt{10}} = 2.66](https://tex.z-dn.net/?f=s%20%3D%20%5Cfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D%20%3D%20%5Cfrac%7B8.4%7D%7B%5Csqrt%7B10%7D%7D%20%3D%202.66)
PartB: what does the sample size need to be if you want the standard deviation of the sampling distribution of x hat to be 2.8?
This is n when
. So
![s = \frac{\sigma}{\sqrt{n}}](https://tex.z-dn.net/?f=s%20%3D%20%5Cfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D)
![2.8 = \frac{8.4}{\sqrt{n}}](https://tex.z-dn.net/?f=2.8%20%3D%20%5Cfrac%7B8.4%7D%7B%5Csqrt%7Bn%7D%7D)
![2.8\sqrt{n} = 8.4](https://tex.z-dn.net/?f=2.8%5Csqrt%7Bn%7D%20%3D%208.4)
![\sqrt{n} = \frac{8.4}{2.8}](https://tex.z-dn.net/?f=%5Csqrt%7Bn%7D%20%3D%20%5Cfrac%7B8.4%7D%7B2.8%7D)
![\sqrt{n} = 3](https://tex.z-dn.net/?f=%5Csqrt%7Bn%7D%20%3D%203)
![(\sqrt{n})^2 = 3^2](https://tex.z-dn.net/?f=%28%5Csqrt%7Bn%7D%29%5E2%20%3D%203%5E2)
![n = 9](https://tex.z-dn.net/?f=n%20%3D%209)
Answer:
5
Step-by-step explanation:
y-x
8-5 = 5