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dimulka [17.4K]
3 years ago
15

Factor 18x^3+24x^2-21x-28

Mathematics
1 answer:
maks197457 [2]3 years ago
8 0
Hello my name is Jeff (sorry)
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The 90% confidence interval for the mean time required by all college graduates is between 5.36 years and 5.44 years.

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We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

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So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

Now, find the margin of error M as such

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In which \sigma is the standard deviation of the population and n is the size of the sample.

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The lower end of the interval is the sample mean subtracted by M. So it is 5.4 - 0.04 = 5.36 years.

The upper end of the interval is the sample mean added to M. So it is 5.4 + 0.04 = 5.44 years.

The 90% confidence interval for the mean time required by all college graduates is between 5.36 years and 5.44 years.

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