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nadya68 [22]
2 years ago
12

Can i get some help with these 2 problems

Mathematics
1 answer:
denis-greek [22]2 years ago
8 0
I hope this helps you

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When sample size increases:____.
sergij07 [2.7K]

Answer:

D. Confidence interval decreases.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean \mu = p and standard deviation s = \sqrt{\frac{p(1-p)}{n}}

When sample size increases:

The standard deviation of the sample mean is:

s = \frac{\sigma}{\sqrt{n}}

That is, it is inversely proportional to the sample size, so if the sample size incerases, the standard deviation decreases, and so does the confidence interval.

This means that the correct answer is given by option D.

3 0
3 years ago
I don’t understand how to do this problem.
shepuryov [24]

What Is Yo Question ?

4 0
3 years ago
Read 2 more answers
Easy please help asap!!
Inga [223]
The ratio is 2:1 and the same for area
4 0
2 years ago
An object moves clockwise around a circle centered at the origin with radius 5 m beginning at the point ​(0,5​). a. Find a posit
Travka [436]

Answer:

a, r = A sin (ωt±Ф) =5 Sin (3.9 t ± 2π) b. A e^-ωt = 5 e^-3.9 t

Step-by-step explanation:

ω =2πr/t =2π*5/8 =3.9 rad/sec, amplitude will be 5 (0, 5 )

6 0
2 years ago
On Thursday the Meat King Market sold 1,212 pounds of ground beef. On
Tresset [83]

Answer:

287 pounds

Step-by-step explanation:

1212 X 2= 2424

2424-2137= 287

8 0
3 years ago
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