Two car dealerships (A & B) locked in heated debate as to which was busier over a three-year span decided to contact you to perform a scientific test that would solve their dispute once and for all. They presented the tabular data below of the annual number of sedan sales for the years 2001, 2002 and 2003.   Table 1. Observed number of sedan sales by year Dealership Sedan Sale Years 2001 2002 2003 A 20 15 30 B 20 20 25 Table 2. Expected number of sedan sales by year Dealership Sedan Sale Years 2001 2002 2003 A 20 17.5 27.5 B 20 17.5 27.5 Now that we have observed and expected sedan numbers for each cell of the table, what is your calculated chi-square statistic? (Specify to 2 decimal places).

Primary prevention attempts to intervene before disease/infection occurs. 

All of the following are advantages of a case-control study except:

In a state that did not require varicella (chickenpox) vaccination, a boarding school experienced a prolonged outbreak of varicella among its students that began in September and continued through December. To calculate the probability or risk of illness among the students, which denominator would you use?

Which of the following sources could be used for determining life expectancy?

Which of the following involves the formal adoption of the policies, programs, and procedures that are designed to protect society from public health hazards?

Used in case-control studies, a type of indirect measure of the association between frequency of exposure and frequency of outcome is known as the:

True/False. In developed countries, chronic health problems have replaced infectious diseases as the leading killers during the past century.  

A stage that takes place during the early phases of pathogenesis and includes activities that limit the progression of disease:

True/False. A parameter estimate refers to the single best estimate of an association between an exposure and a disease or the single best estimate of the prevalence of a condition.