Question

In a survey, people were asked whether they prefer candidate A
or candidate B. Out of 264 people, 90 said they prefer candidate
A.

Find the sample proportion and 95% confidence interval for
this statistic. (Round all answers to 2 decimal places.)

Sample proportion=

Confidence Interval= to =

Answer #1

In a 2008 survey, people were asked their opinions on
astrology - whether it was very scientific, somewhat scientific,
or not at all scientific. Of 1440 who responded, 71 said astrology
was very scientific. a. Find the proportion of people in the survey
who believe astrology is very scientific. b. Find a 95% confidence
interval for the population proportion with this belief. c. Suppose
a TV news anchor said that 5% of people in the general population
think astrology is...

In a recent poll, 600 people were asked if they liked soccer,
and 10% said they did. Based on this, construct a 90% confidence
interval for the true population proportion of people who like
soccer.
As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.
Give your answers as decimals, to 4 decimal places.
[________, ________]

In a recent poll, 300 people were asked if they liked soccer,
and 37% said they did. Based on this, construct a 90% confidence
interval for the true population proportion of people who like
soccer.
As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.
Give your answers as decimals, to 4 decimal places.
[,]

A random sample of adults were asked whether they prefer reading
an e-book over a printed book. The survey resulted in a sample
proportion of p̂ =0.14, with a sampling standard deviation of σp̂
=0.02, who preferred reading an e-book. Use the Empirical Rule to
construct a 95% confidence interval for the true proportion of
adults who prefer e-books.

In a poll survey 1200 people were chosen by random sampling and
asked whether they supported a proposed amendment or not. 216 of
the participants supported it. Determine the 95% confidence
interval for the proportion of amendment supporters. What are the
lower and upper bounds of the confidence interval?

In a survey, 90 people were asked if they received at least
some of their news from social media. 61 responded Yes.
(a) What is the 95% confidence interval for the proportion of
people in the population who receive at least some of their news
from social media?
(b) Working at the 95% confidence level, how large a sample
would be necessary to estimate the population proportion with a
margin of error of ±0.02? Assume a planning value of p∗...

A poll asked people in the U.S. whether they were satisfied with
their financial situation. Out of 2038 people, 478 reported that
they were satisfied. Two years later, the second poll was taken
asking the same question. The second poll found 537 out of 1976
people were satisfied.
(a) Construct a 95% confidence interval for the change in
proportion of people satisfied in their financial situation over
the two years.
(b) A sociologist claims the proportion increased by more than...

In a recent poll, 500 people were asked if they liked baseball,
and 57% said they did. Find the margin of error of this poll, at
the 95% confidence level. As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval --Use z = 2 for a 95%
confidence interval --Use z = 2.576 for a 99% confidence interval.
Give your answer rounded to three decimal places.

A survey asked whether respondents favored or opposed the death
penalty for people convicted of murder. Software shows the results
below, where X refers to the number of the respondents who were in
favor. Construct the 95% confidence interval for the proportion of
the adults who were opposed to the death penalty from the
confidence interval stated below for the proportion in favor.
x- 1767
n- 2617
sample p- .6752
95.0% CI- (.657, .693)

a.In a survey, 21 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $40 and standard deviation of $9. Construct a
confidence interval at a 80% confidence level. Give your answers to
one decimal place.
b. If n=30, ¯x¯(x-bar)=48, and s=9, find the margin of error at
a 80% confidence level
Give your answer to two decimal places.
c. In a survey, 22 people were asked how...

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