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2 years ago

Evaluate each expression.

Mathematics

2 answers:

Elan Coil [88]2 years ago

8 0

Answer:

-1

Step-by-step explanation:

-9-3 = -12

18-6 = 12

-12/12 = -1

nika2105 [10]2 years ago

5 0

Answer:

-1

Step-by-step explanation

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A.) is the correct answer.

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Answer:

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Step-by-step explanation:

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The standard deviation of a sample taken from population A is 17.6 for a sample of 25.

lawyer [7]

Answer:

The standard deviation of the sample mean differences is _5.23_

Step-by-step explanation:

We have a sample of a population A and a sample of a population B.

For the sample of population A, the standard deviation $\sigma_A$ is

$\sigma_A = 17.6$

The sample size $n_A$ is:

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For the sample of population B, the standard deviation $\sigma_B$ is

$\sigma_B = 21.2$

The sample size $n_B$ is:

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$\sigma=\sqrt{\frac{\sigma_A^2}{n_A}+\frac{\sigma_B^2}{n_B}}$

Finally

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3 years ago

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Answer:

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Step-by-step explanation:

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