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Essentials of Biostatistics in Public Health, Fourth Edition Chapter 9 Question 20
Essentials of Biostatistics in Public Health, Fourth Edition 9.7 Practice Problems 20. A study
evaluated predictors of perceived risk of infection with COVID19 (the outcome) by generational
birth cohort (the primary independent variable), gender, race/ethnicity, urbanicity, family
income, and political affiliation. The regression coefficient from the multiple linear regression
model associated with living in a rural area (as compared to an urban area) was 6.5 (95% Cl:
2.0, 10.9). Which of the following is not true? a. Perceived risk of infection with COVID-19 was
6.5 units higher among those living in rural areas as compared to urban areas. b. There is a
statistically significant difference in perceived risk of infection with COVID-19 in those living in
rural versus urban areas. c. The investigators modeled urbanicity with an indicator variable
coded 1 for rural and 0 for urban. d. There is no statistically significant difference in perceived
risk of infection with COVID-19 in those living in rural versus urban areas.

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