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2 years ago

Write the fraction below as a sum or difference.

Mathematics

1 answer:

timofeeve [1]2 years ago

5 0

Answer: C

Step-by-step explanation:

You would need to divide the 5z and 3 by 4. Putting 5z and 3 as the numerator in a fraction with 4 as the denominator is the same because you’re dividing both values by 4. I think I may have explained it badly, so if someone has a better explanation, can you add that in the comments or in an answer?

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3 years ago

Using the simple random sample of weights of women from a data set, we obtain these sample statistics: nequals45 and x overbar

Tomtit [17]

Answer: (141.1, 156.48)

Step-by-step explanation:

Given sample statistics : $n=45$

$\overline{x}=148.79\text{ lb}$

$\sigma=31.37\text{ lb}$

a) We know that the best point estimate of the population mean is the sample mean.

Therefore, the best point estimate of the mean weight of all women = $\mu=148.79\text{ lb}$

b) The confidence interval for the population mean is given by :-

$\mu\ \pm E$ , where E is the margin of error.

Formula for Margin of error :-

$z_{\alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given : Significance level : $\alpha=1-0.90=0.1$

Critical value : $z_{\alpha/2}=z_{0.05}=\pm1.645$

Margin of error : $E=1.645\times\dfrac{31.37}{\sqrt{45}}\approx 7.69$

Now, the 90% confidence interval for the population mean will be :-

$148.79\ \pm\ 7.69 =(148.79-7.69\ ,\ 148.79+7.69)=(141.1,\ 156.48)$

Hence, the 90% confidence interval estimate of the mean weight of all women= (141.1, 156.48)

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2 years ago

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otez555 [7]

Answer:

Step-by-step explanation:

Using the rule of exponents

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Given

$6^{-3}$

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

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