Question

Pharmaceutical companies advertise for the birth control pill an
annual efficacy of 99.7% in preventing pregnancy. However, under
typical use the real efficacy is only about 93%. That is, 7% of
women taking the pill for a year will experience an unplanned
pregnancy that year. The difference between these two rates is that
the real world is not perfect: for example, a woman might get sick
or forget to take the pill one day, or she might be prescribed
antibiotics which interfere with hormonal metabolism. If a sexually
active woman takes the pill for the four years she is in college,
what is the chance that she will become pregnant at least once?
(Assume that the chance of pregnancy for each year is
independent).

(b) Give your answer using the real efficacy of the pill. Please
use 4 decimal places.

Answer #1

Pharmaceutical companies advertise for the pill an efficacy of
99.4% in preventing pregnancy. However, under typical use the real
efficacy is only about 97%. That is, 3% of women taking the pill
for a year will experience an unplanned pregnancy that year. A
gynecologist looks back at a random sample of 530 medical records
from patients who had been prescribed the pill one year
before.
(a) What are the mean and standard deviation of the distribution of
the sample proportion...

Pharmaceutical companies advertise for the pill an efficacy of
99.9% in preventing pregnancy. However, under typical use the real
efficacy is only about 96%. That is, 4% of women taking the pill
for a year will experience an unplanned pregnancy that year. A
gynecologist looks back at a random sample of 540 medical records
from patients who had been prescribed the pill one year before.
(a) What are the mean and standard deviation of the distribution
of the sample proportion...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 6 minutes ago

asked 10 minutes ago

asked 10 minutes ago

asked 11 minutes ago

asked 11 minutes ago

asked 21 minutes ago

asked 23 minutes ago

asked 39 minutes ago

asked 43 minutes ago

asked 54 minutes ago

asked 58 minutes ago