Question

STATISTICS: Use the data in Bank Dataset (from Unit 1 Exercise Question 2) to answer this question.

a. Construct a 95% confidence interval to estimate the proportion of customers who would recommend the Bank to family and friends after the change.

b. What is the margin of error of the estimate at the 95% confidence level?

**DATASET HAS 132/152 WHO RECOMMENDED THE BANK AFTER
CHANGE AND 20/152 WHO DID NOT RECOMMEND THE BANK AFTER
CHANGE.**

Answer #1

A sample of 152 statistics students were surveyed concerning
their future pet ownership. Of the 152 students in the sample, 82
responded that they plan on getting a dog after graduating.
Construct a 95% confidence interval for the proportion of
statistics students overall (i.e., the entirepopulation) that want
to get a dog.
Suppose we wanted to take another sample to estimate the
percent of percentage of statistics studentsthat want to get a dog.
Find the sample size we need to...

Question 18
A utlility company sampled 537 customers, and finds that 103 of
them had a discrpancy on their service bill. What is the upper
bound for the 99% confidence interval for the proportion of
customers with a discrepancy on their service bill?
Round to three decimal places (for example: 0.419). Write only a
number as your answer.
Question 19
A pollster wants to construct a 95% confidence interval for the
proportion of adults who believe that economic conditions are...

Chapter 6, Section 1-CI, Exercise 011
Use the normal distribution to find a confidence interval for a
proportion p given the relevant sample results. Give the
best point estimate for p, the margin of error, and the
confidence interval. Assume the results come from a random
sample.
A 95% confidence interval for p given that p^=0.34 and
n=475.
Round your answer for the best point estimate to two decimal
places, and your answers for the margin of error and the...

Use the data in Bank Dataset to answer this question.
Construct a 95% confidence interval for the mean increase in
deposits. Note that the population standard deviation σ is not
known in this case. Instead the sample standard deviation s should
be calculated from the sample and the t distribution should be
used.
2. What is the margin of error at the 95% confidence level?
Bank Dataset of Increase in deposits. Mean is 4. Sample size is
152 customers.
4.3...

Chapter 6, Section 1-CI, Exercise 012 Use the normal
distribution to find a confidence interval for a proportion given
the relevant sample results. Give the best point estimate for , the
margin of error, and the confidence interval. Assume the results
come from a random sample. A 95% confidence interval for p given
that p-hat = 0.9 and n = 120 . Round your answer for the point
estimate to two decimal places, and your answers for the margin of...

A small company involved in e-commerce is interested in
statistics concerning the use of e-mail. A poll found that 36% of
a random sample of 1084 adults, who use a computer at their home,
work, or school, said they do not send or receive e-mail.
Complete parts a through e. a) Find the margin of error for this
poll if we want 99% confidence in our estimate of the percent of
American adults who do not use e-mail. MEequals 34...

1) The Pew Research Center Internet Project conducted a survey
of 907 Internet users. This survey provided a variety of statistics
on them. If required, round your answers to four decimal places.
(a) The sample survey showed that 90% of respondents said the
Internet has been a good thing for them personally. Develop a 95%
confidence interval for the proportion of respondents who say the
Internet has been a good thing for them personally. to (b) The
sample survey showed...

1)A sample of size is drawn from a population whose
standard deviation is Find the margin of error for
a confidence interval for μ.
2)A researcher wants to construct a 98% confidence interval for
the proportion of elementary school students in Seward County who
receive free or reduced-price school lunches. What sample size is
needed so that the confidence interval will have a margin of error
of 0.09?
3)An Internet service provider sampled 540 customers and found
that 55 of them experienced an...

In a survey of 1000 US
adults, twenty percent say they never exercise. This is the highest
level seen in five years.
a) Verify that the
sample is large enough to use the normal distribution to find a
confidence interval for the proportion of Americans who never
exercise. (Are the conditions met?) Use a formula to justify your
answer or, if possible, explain your reasoning.
b) Construct a 90%
confidence interval for the proportion of U.S. adults who never...

Please answer each question and explain how you found
the correct answer.
2. Additionally, customer satisfaction surveys have indicated
that 65% (p=.65) of all TGP customers rate service as good or
excellent. You are taking a new survey to see if this is still the
case. Assuming a normal distribution, what is the probability
that:
a) your inquiry of 90 customers will provide a sample proportion
within + and - .10 of the population proportion?
b) Your inquiry of 90...

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