In the first half of the 20th century, whooping cough was a frequently occurring bacterial infection that
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1925 1970.
Incidence Rates for Whooping Cough, 19251970
Year Rate per 100,000
1925.......... 131.2
1930.......... 135.6
1935.......... 141.9
1940.......... 139.6
1945.......... 101.0
1950.......... 80.1
1955.......... 38.2
1960.......... 8.3
1965.......... 3.5
1970.......... 2.1
Data from Historical Statistics of the United States, Colonial Times to 1970, U.S. Department of Commerce, p. 77.
a. Sketch a time plot. What type of trend do you observe? Based on the trend from 19451970, was the whooping cough vaccination proving effective in reducing the incidence of whooping cough?
b. The figure shown is a time plot of the data from 19801999, reported in the Morbidity and Mortality Weekly Reports (MMWR). 3 What has the incidence rate been since about 1993? How does the incidence rate since 1993 compare with the incidence rate in 1970? Is the United States close to eradicating whooping cough? (Note: In the years 20062008, the incidence rates were 5.27, 3.49, and 4.40 respectively.)
c. Would a histogram of the incidence rates since 1935 address the question about the success of the vaccination for whooping cough? Why or why not?
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Related Book For
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin
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