A pilot test of screening for colon cancer and precancerous polyps was conducted in a population where the prevalence of

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A pilot test of screening for colon cancer and precancerous
polyps was conducted in a population where the prevalence of
precancerous polyps was 1%. The screening test showed a Sensitivity
of 90%, a Specificity of 80%, and a Predictive Value Positive of
15%. The best and most efficient way to improve the
Predictive Value Positive would be to:
Group of answer choices
Expand the screening program to a population with a larger
number of individuals to be screened.
Change the test to improve the Sensitivity to 95% and Decrease
the Specificity to 70%
Conduct the next screening program in a targeted older
population with a prevalence of 10%
Locate a population with a lower prevalence of precancerous
polyps and conduct the screening there.