3 years ago

Match the missing angle measurements to diagram

Mathematics

1 answer:

JulsSmile [24]3 years ago

4 0

Please include the diagram, but all angles in a quadrilateral equal up to 360 and all triangles angles equal up to 180

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2 years ago

Which expressions represent a difference of squares?

andrew-mc [135]

Answer:

$25 {x}^{2} - 36\\ 1-16x^2\\4x^2 - 12x + 9$

Step-by-step explanation:

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3 years ago

the perimeter of a scalene triangle is 14.5 cm. The longest side is twice that of the short side. Which equation can be used to

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2 years ago

If x is -3 and y is 2 what is x ^ 2 + y ^ 2

Pavlova-9 [17]

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ans=-2

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2 years ago

a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval

il63 [147K]

We cannot calculate the confidence interval without the sample size. However, for the second question, the sample size needed would be 49.

The formula we use is

$n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2$

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
$n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49$

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2 years ago