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scoray [572]
2 years ago
8

When x 4, y = 1 х^2 + Зry — 7у^2 Can you explain the whole answer.

Mathematics
1 answer:
sineoko [7]2 years ago
3 0
I couldn’t really understand the question but i did 4squared + 3r(1) - 7(1)squared and i got -33 + 3r
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a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval
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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:
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