Which of the Following Statements Is True About Probability Samples?​

question 4

Multiple Choice

Which of the following statements is true about probability samples?​

• A) ​They avoid conscious and unconscious sampling bias.
• B) They do NOT permit the estimation of the accuracy or representativeness of the sample.​
• C) They are perfectly representative of the population from which they are drawn.​
• D) They are more risky than non-probability samples.​
• E) ​a and b only are correct.

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Definitions:

Specificity

The ability of a test to correctly identify those without the disease or condition being tested for.

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.