2. For each of the following examples (a, b, and c), (1) first indicate if the statistic is a proportion or rate and

explain your answer; (2) and then, indicate if the statistic represents a measure of prevalence, cumulative

incidence, or incidence rate and explain your answer.

a. The COVID Data Tracker was established by the Center for Disease Control and Prevention (CDC) to

monitor cases, deaths, trends of COVID-19 and to track the vaccine deliveries and administration in

the US: https://covid.cdc.gov/covid-data-tracker/#vaccinations_vacc-total-admin-rate-total. Data

in the table are based on information provided on the website as of October 20, 2021.

b. There were 9,350 new cases of COVID-19 per 100,000 persons confirmed for the overall US

population, compared to 30,780 new cases of COVID-19 per 100,000 persons for the prison

population between April 5, 2020 and April 3, 2021.

C.

Number of US older adults living in nursing homes who died from COVID

Total person - years contributed by US older adults living in nursing hon