Question

A market survey was conducted to estimate the proportion of
homemakers who would recognize the

brand name of a cleanser based on the shape and the color of the
container. Of the 1400 homemakers

sampled, 420 were able to identify the brand by name. Find a 96%
confidence interval estimate for

the population proportion. Round only the last calculation (both
endpoints of the interval) to two

decimal places. Give also complete confidence statement. What will
happen to the width of obtained

interval if we decrease a sample size?

Answer #1

A survey was conducted to estimate the proportion of car drivers
who use seatbelts while driving. Of the 1500 drivers sampled, 520
drivers said, they always use a seatbelt while driving. The same
study of charity contributions revealed that 20 of the 50 families
sampled do charity regularly.
1. Should the finite-population correction factor be used? Why
or why not?
2. Construct the 95 percent confidence interval for the proportion
of families doing charity regularly.

A survey was conducted to estimate the proportion of California
workers who would rather live in a different state. In a
random sample of 100 California workers, 28% indicated that they
would rather living in another state. A 95% confidence
interval for the proportion of all Californian workers who would
rather live in another state is:
Group of answer choices
(0.164, 0.396)
(0.192, 0.368)
(0.207, 0.353)
(0.230, 0.330)

The American Veterinary Medical Association conducted a survey
of veterinary clinics to estimate the proportion that do not treat
large animals (cows, horses, etc.). The survey was mailed to a
random sample of 120 veterinary clinics throughout the country and
of these, 88 responded that they do not treat large animals. A 95%
confidence interval for p, the proportion of veterinary clinics
that do not treat large animals would be wider. would be the same
length. would be narrower. could...

A survey of 250 voters was conducted to determine who they would
vote for in an upcoming election for sheriff. Fifty-five percent
said they would vote for Longmire.
A/ What is the best unbiased estimate of the population
proportion that will vote for Longmire (in other words, what is
?)
B/ Find the margin of error E that corresponds to a 90% confidence
Interval.
C/ Construct the 90% confidence interval about the population
proportion p.
D/ Based on your results,...

The American Veterinary Medical Association (AMVA) conducted a
survey of veterinary clinics to estimate the proportion that do not
treat large animals (cows, horses, etc.). The survey was
mailed to a random sample of 194 veterinary clinics throughout the
country and of these, 148 responded that they do not treat large
animals. Give a 95% confidence interval for the proportion of all
vet clinics that do not treat large animals. [6
points]
Make sure to include each of the
following for full...

1. A city official claims that the proportion of all commuters
who are in favor of an expanded public transportation system is
50%. A newspaper conducts a survey to determine whether this
proportion is different from 50%. Out of 225 randomly chosen
commuters, the survey finds that 90 of them reply yes when asked if
they support an expanded public transportation system. Test the
official’s claim at α = 0.05.
2. A survey of 225 randomly chosen commuters are asked...

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