I need help with a few homework questions, I have put them on a word document to make it easier to solve. there are 10 questions and they each have a and b. 1.)
An automobile manufacturer would like to know what proporTon of its customers are not
saTsFed with the service provided by the local dealer. ±he customer relaTons department will
survey a random sample of customers and compute a 95% conFdence interval for the
proporTon who are not saTsFed.
(a) Past studies suggest that this proporTon will be about 0.17. ²ind the sample size needed if
the margin of the error of the conFdence interval is to be about 0.015.
(You will need a critcal value accuraTe To aT leasT 4 decimal places.)
(b) Using the sample size above, when the sample is actually contacted, 25% of the sample say
they are not saTsFed. What is the margin of the error of the conFdence interval?
A Gallup poll asked a sample of Canadian adults if they thought the law should allow doctors
to end the life of a paTent who is in great pain and near death if the paTent makes a request in
wriTng. ±he poll included 250 people in Quebec, 185 of whom agreed that doctor-assisted
suicide should be allowed.
(a)What is the margin of error of the large-sample 99.8% conFdence interval for the proporTon
of all Quebec adults who would allow doctor-assisted suicide?
(b) How large a sample is needed to get a ³3 percentage point margin of error (this is very
commonly used)? Use the previous sample as a pilot study to get p*.
(You may need four decimal places in your criTcal value to solve this problem.)
Over half of all American teens (ages 12 to 17 years) have an online proFle, mainly on
²acebook. A random sample of 503 teens with proFles found that 372 included photos of
(a) Give the 99.8% large-sample conFdence interval for the proporTon
of all teens with
proFles who include photos of themselves.
Large-sample Interval: to
This question was answered on: Sep 21, 2023
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