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notka56 [123]
3 years ago
7

What is AB? Please show work...

Mathematics
1 answer:
Grace [21]3 years ago
8 0
The formula to find AB is a^2+b^2=c^2, where a is the left side, b is the bottom, and c is  x.  2^2 is 4, so it asks for the sq. rt. of 8, which is 2.83 (rounded to the nearest hundredth).
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In a randomly selected sample of 100 students at a University, 81 of them had access to a computer at home. Give the value of th
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Answer:

The value of the standard error for the point estimate is of 0.0392.

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}}

In a randomly selected sample of 100 students at a University, 81 of them had access to a computer at home.

This means that n = 100, p = \frac{81}{100} = 0.81

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This is s. So

s = \sqrt{\frac{0.81*0.19}{100}} = 0.0392

The value of the standard error for the point estimate is of 0.0392.

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