In a Study Performed by the Statistics Classes at Jefferson

question 38

Essay

In a study performed by the statistics classes at Jefferson High School, city parking
spaces were examined for compliance with the requirement to put money in the
parking meters. Overall, the students found that 80% of metered parking places had
meters that were not expired, and 20% had meters that were expired. If the traffic
officer in charge of ticketing checks meters at random, what is the probability he or
she will find an expired meter before the 3rd one checked?

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Definitions:

Positive Predictive Value

The probability that subjects with a positive screening test truly have the disease.

Prevalence

The total number of cases of a disease that exist in a particular population at a specific time.

False-Positive Diagnosis

An erroneous identification where a test incorrectly indicates the presence of a condition that is actually absent.

Diagnostic Procedures

Medical tests and evaluations performed to identify the presence of a disease or determine its severity in a patient.