Earthquakes On January 23, 2001, an earthquakeregistering 7.9 hit western India, killing more than15,000 people. On the same day, an earthquakeregistering 4.8 hit the United States, killing no one. Howmuch more intense was the Indian earthquake than theAmerican earthquake?

Q: How did we get 85.89  and 0.1235 using a calculator to get the correct answer?  Thanks!

A: Population mean, μ=80 Population standard deviation, σ=7

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A:

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A: Formula for Average,      Average=Sum of the all numbersCount of the numbers=x1+x2+...+xnn

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.