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Question 1 . The weekly excess death rate for each city is the sample mean of the data from several reporting stations (hospitals, clinics, etc.)

Question 1. The weekly excess death rate for each city is the sample mean of the data from several reporting stations (hospitals, clinics, etc.) within a 50 mile radius of the city. Determine the 95% CI for the mean week 7 excess death rate in the city with the highest reported week 7 excess death rate. Assume this city receives data from n = 38 reporting stations and that the sample standard deviation s = 463.

lower bound

upper bound

Are the New York City and Pittsburgh mean week 7 excess death rates significantly different? Perform a 2-tail hypothesis test for mu(NYC)- mu(PITT). Assume n(NYC) = 50, n(Pitt) = 35, s(NYC) = 239, s(Pitt) = 214. DO NOT use the approximation minimum(n1-1, n2-1) for the degrees of freedom.

Question 2a. What is the value of the test statistic for this hypothesis test?

Question 2b. Select the correct choice concerning the P-value for this hypothesis test.

P-value?0.0001

0.001?P-value?.01

P-value?0.05

0.02?P-value?0.04

0.10?P-value?0.15

Question 2c. What is the correct conclusion for this hypothesis test?

Reject the null hypothesis and conclude that the mean week 7 excess death rates are different. There is evidence that Pittsburgh's mean week 7 death rate is higher than New York's.

Do not reject the null hypothesis; there is no significant difference in the mean week 7 excess death rates.

Accept the null hypothesis; the mean week 7 excess death rates are equal.

Reject the null hypothesis and conclude that the mean week 7 excess death rates are not significantly different.

image text in transcribed
1918 Spanish Flu Pandemic excess weekly death rate (annual basis) per 100,000 8000 6000+ city BUFFALO CHICAGO NASHVILLE 4000+ NEW ORLEANS NEW YORK PITTSBURGH 2000 5 6 Week 1:week ending 14-Sep. 1918.. Week 7:week ending 26-Oct. 1918

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