(Solution) An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by the local dealer. The... > Snapessays.com

(Solution) An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by the local dealer. The...

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.)

Sample

size:

(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?

MoE:

2.)

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?

MoE:

(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.)

Sample

size:

3.)

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

themselves.

(a) Give the 99.8% large-sample conFdence interval for the proporTon

p

of all teens with

proFles who include photos of themselves.

Large-sample Interval: to

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This question was answered on: Sep 21, 2023

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