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3 years ago

HELP PLZ AND EXPLAIN

Mathematics

1 answer:

Marat540 [252]3 years ago

5 0

Hey there! :D

Find 10% of 85.

10%=.10

85*.10= 8.5

Add that to 85.

85+8.5= 93.5

We could also see if this 10% error is in the other direction.

85-8.5= 76.5 <== this is not an answer choice

So, we know it must be "A" 93.5 C

I hope this helps!
~kaikers

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t is known that the population variance equals 484. With a 0.95 probability, the sample size that needs to be taken if the desir

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Step-by-step explanation:

To get alpha; we have 1 - 0.95 = 0.05

Therefore, $z_{\frac{a}{2} } = \frac{0.05}{2} = 0.025$

The we look up z* in a Standard Normal table where α = 0.025 area in each tail.

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And margin of error is 5 or less

The formula for margin of error is given as:

margin of error = $\frac{(z^{*}) (SD)}{\sqrt{n} }$

$5 = \frac{1.96 * 22}{\sqrt{n} } \\5 = \frac{43.12}{\sqrt{n} } \\5 * \sqrt{n} = 43.12\\(5)^{2} * (\sqrt{n} )^{2} = (43.12)^2\\25 * n = 1859.3344\\25n = 1859.3344\\\frac{25n}{25} = \frac{1859.3344}{25} \\n = 74.373376\\n = 74$

The approximate value of n is 74.

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