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4 years ago

Help with 54 show work plz

Mathematics

1 answer:

Doss [256]4 years ago

8 0

B because it is asking for the height so it would come out as something like 3 ft or 4 inches etc. D because it is asking for a specific amount like 4 cups etc. and E because they are also asking for a specific amount. I think A too but im not 100% sure. I think it would be A because they are also asking for a specific amount

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What is the formula for a confidence interval?

ikadub [295]

Answer:

a) The formula is given by mean $\pm$ the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.

b) $\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

If the distribution for X is normal or if the sample size is large enough we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

Part a

The formula is given by mean $\pm$ the margin of error. Where the margin of error is the product between the critical value from the normal standard distribution at the confidence level selected and the standard deviation for the sample mean.

Part b

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$

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4 years ago

ASAP I NEED HELP WITH THIS!!!

tamaranim1 [39]

Answer:

Step-by-step explanation:

Sector of Area=(theta/360)*pi*r^2

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3 years ago