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Coherence refers to which guideline of Hill’s Causality criteria?

200 people were screened for disease Y using a new rapid test and then tested with a gold standard for confirmation. The table below shows the results   Gold standard Disease + Gold standard Disease –   New Test + 50 35 85 New Test – 20 95 115   70 130 200 Which of the following is the negative predictive value of the test?

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

200 people were screened for disease Y using a new rapid test and then tested with a gold standard for confirmation. The table below shows the results   Gold standard Disease + Gold standard Disease –   New Test + 50 35 85 New Test – 20 95 115   70 130 200 Which of the following is the number of false-positives:

A stage that takes place during the later phases of pathogenesis and includes activities that aid in the recovery from symptoms of disease, such as physical rehabilitation of a stroke victim: 

Primary prevention attempts to intervene before disease/infection occurs. 

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).

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?

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

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