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# In a certain year, there were 80 days with measurable snowfall in Denver, and 63 days ISBN: 9780073401331 38

## Solution for problem 11 Chapter 5.5

Statistics for Engineers and Scientists | 4th Edition

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Problem 11

In a certain year, there were 80 days with measurable snowfall in Denver, and 63 days with measurable snowfall in Chicago. A meteorologist computes (80 + 1)/(365 + 2) = 0.22, (63 + 1)/(365 + 2) = 0.17, and proposes to compute a 95% confidence interval for the difference between the proportions of snowy days in the two cities as follows: 0.22 0.17 1.96(0.22)(0.78) 367 + (0.17)(0.83) 367 Is this a valid confidence interval? Explain

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Hypothesis Test 1. Null­ Ho­ a. NOT p hat b. = or less than and = Alternative­ Ha a. Not equal to b. Greater than c. Less than d. From research question 2. Check a. NP (Size)(Po)= predictable victories b. N(1­P) (size)(1­Po)= predictable disappointments...

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##### ISBN: 9780073401331

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