Question

A certain forum reported that in a survey of 2002 American adults, 22% said they believed in astrology.

(a)

Calculate a confidence interval at the 99% confidence level for the proportion of all adult Americans who believe in astrology. (Round your answers to three decimal places.)

,

Interpret the resulting interval.

We are 99% confident that the true population mean lies above this interval. We are 99% confident that this interval does not contain the true population mean. We are 99% confident that the true population mean lies below this interval. We are 99% confident that this interval contains the true population mean.

(b)

What sample size would be required for the width of a 99% CI to
be at most 0.05 irrespective of the value of *p̂*? (Round
your answer up to the nearest integer.)

Answer #1

In a recent household telephone survey of 2,870 adults in a
certain? country, 28?% reported that they own at least one gun. The
researchers want to estimate the true percentage of adults in that
country that own at least one gun. Complete parts
a through f below.
a. Identify the population of interest to the
researchers. Choose the correct answer below.
A.The set of adults that responded to the survey
B.The set of guns in the country
C.The set of...

TV advertising agencies face increasing challenges in reaching
audience members because viewing TV programs via digital streaming
is gaining in popularity. A poll reported that 52% of 2343 American
adults surveyed said they have watched digitally streamed TV
programming on some type of device.
What sample size would be required for the width of a 99% CI to
be at most 0.04 irrespective of the value of p̂? (Round
your answer up to the nearest integer.)

490/654 Venezuelan women from the armed forces said they were
not interested in American Football. A 95% confidence interval for
the proportion with no interest in American Football is 0.70 to
0.80.
A) What would margin of error be for the CI of this
proportion?
Wouldn't this just be 10%?
B) We then sampled 1568 more Venezuelan woman. They were also
asked if they had interest in American Football. If we constructed
another CI based on this sample, how would...

In a survey on supernatural experiences, 724 of 4003 adult
Americans surveyed reported that they had seen or been with a
ghost.
(a) What assumption must be made in order for it to be
appropriate to use the formula of this section to construct a
confidence interval to estimate the proportion of all adult
Americans who have seen or been with a ghost?
We need to assume that there are only 724 adult Americans.We
need to assume that the 4003...

22
A researcher is interested in finding a 98% confidence interval
for the mean number minutes students are concentrating on their
professor during a one hour statistics lecture. The study included
101 students who averaged 35.2 minutes concentrating on their
professor during the hour lecture. The standard deviation was 12.1
minutes. Round answers to 3 decimal places where possible.
a. To compute the confidence interval use a
distribution.
b. With 98% confidence the population mean minutes of
concentration is between...

A Gallup poll asked 175 American adults whether they were
baseball fans and 65% said they were. Find the margin of error if
we want to create a 90% confidence interval for the true proportion
of American adults who are baseball fans. Write your answer in
decimal format to 3 decimal places. For example, 0.123 would be the
correct format.

a survey of 2075 adults in a certain country conducted during a
period of economic uncertainty, 64% thought that wages paid to
workers in industry were too low. The margin of error was 8
percentage points with 90% confidence. For parts (a) through (d)
below, which represent a reasonable interpretation of the survey
results? For those that are not reasonable, explain the flaw. (a)
We are 90% confident 64% of adults in the country during the
period of economic uncertainty...

Is college worth it? Among a simple random
sample of 334 American adults who do not have a four-year college
degree and are not currently enrolled in school, 144 said they
decided not to go to college because they could not afford
school.
1. Calculate a 99% confidence interval for the proportion of
Americans who decide to not go to college because they cannot
afford it, and interpret the interval in context. Round to 4
decimal places.
( , )
2....

In a survey of U.S. adults with a sample size of 2002, 400 said
Franklin Roosevelt was the best president since World War II. Two
U.S. adults are selected at random from the population of all U.S.
adults without replacement. Assuming the sample is representative
of all U.S. adults, complete parts (a) through (d).
(a) Find the probability that both adults say Franklin Roosevelt
was the best president since World War II.
The probability that both adults say Franklin Roosevelt...

Part 1:
In July 2019, Pew Research reported an interesting finding from
a survey it conducted of 1,284 U.S. military veterans: 57 percent
of U.S. veterans approve of Trump’s conduct as commander-in-chief
of the U.S. armed forces. The survey employed probabilistic
sampling.
Construct a 98 percent confidence interval for the true
proportion of American veterans that approves of Trump’s conduct as
commander-in-chief.
Group of answer choices
(a) (0.54, 0.60)
(b) (0.56, 0.58)
(c) (0.53, 0.61)
Part 2:
In the same...

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