Question
In: Statistics and Probability
A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion of such...
A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion of such workers who have changed jobs within the past year.
A)In the absence of preliminary data, how large a sample must be taken to ensure that a 95% confidence interval will specify the proportion to within ±0.02? Round up the answer to the nearest integer.
Answer is not 2401
B) In a sample of 105 workers, 20 of them had changed jobs within the past year. Find a 95% confidence interval for the proportion of workers who have changed jobs within the past year. Round the answers to three decimal places.
The 95% confidence interval is (, ).?
C) In a sample of 105 workers, 20 of them had changed jobs within the past year. Estimate the sample size needed so that the 95% confidence interval will specify the proportion to within ±0.02. Round up the answer to the nearest integer.
Thank you!
Solutions
orchestra answered 2 years agoRelated Solutions
A sociologist is interested in surveying workers in computer-related jobs to estimate the proportion of such...
A sociologist is interested in surveying workers in
computer-related jobs to estimate the proportion of such workers
who have changed the jobs within the past year.
(a) In the absence of preliminary data, how large a sample must
be taken to ensure that a 99% confidence interval will specify the
proportion to within ±0.05?
(b) Is the sample size obtained in (a) large enough to ensure
that a 95% confidence interval will specify the proportion to
within ±0.05? Explain.
(c)...
A sociologist sampled 200 people who work in computer related jobs, and found that 42 of...
A sociologist sampled 200 people who work in computer related
jobs, and found that 42 of them have changed jobs in the past 6
months. Construct a 85% confidence interval for the proportion of
those who work in computer-related jobs who have changed jobs in
the past six months
Jane wants to estimate the proportion of students on her campus who eat cauliflower. After surveying...
Jane wants to estimate the proportion of students on her campus
who eat cauliflower. After surveying 17 students, she finds 2 who
eat cauliflower. Obtain and interpret a 95% confidence interval
for the proportion of students who eat cauliflower on Jane's
campus using Agresti and Coull's method.
Jane wants to estimate the proportion of students on her campus who eat cauliflower. After surveying...
Jane wants to estimate the proportion of students on her campus
who eat cauliflower. After surveying 29 students, she finds 4 who
eat cauliflower. Obtain and interpret a 95% confidence interval
for the proportion of students who eat cauliflower on Jane's
campus using Agresti and Coull's method. LOADING... Click the icon
to view Agresti and Coull's method.
A sociologist wishes to estimate the proportion of parents of college-bound high school students who have...
A sociologist wishes to estimate the proportion of parents of
college-bound high school students who have not saved any money for
college. What sample size would she need for the estimate to be
correct within 6 percentage points with 95% confidence
(a) if she uses a similar study from 2015 that indicates that 32%
of parents had saved no money for college?
(b) if she does not use any prior estimates?
We are interested to estimate the proportion of the population who favor a candidate. Suppose that...
We are interested to estimate the proportion of the population
who favor a candidate. Suppose that 210 of the people in a sample
of 500 favored the candidate.
(a) What is the proportion estimate, p-hat, and the standard
error?
(b) Find the 90% confidence interval for the proportion of the
population who favor the candidate. Interpret result.
The head of a computer science department is interested in estimating the proportion of students entering...
The head of a computer science department is interested in
estimating the proportion of students entering the department who
will choose the new computer engineering option. A preliminary
sample indicates that the proportion will be around
0.208.
What size sample should the department head take if she wants to be
95% confident that the estimate is within 0.02 of
the true proportion?
a. What statistical procedure will solve this problem? A sociologist is interested in determining if the...
a. What statistical procedure will solve this problem? A
sociologist is interested in determining if the number of young
adults in a city is related to the number of burglaries that
occurred in the adult shops in the same city last year.
Group of answer choices
dependent t
Pearson r correlations
independent t
b. What statistical procedure will solve this problem? Just
before retiring from teaching college, a professor wanted to know
if his former students’ final grade scores (which...
The Philadelphia Area Transit Authority wishes to estimate the proportion of central city workers that use public transportation to get to work.
The Philadelphia Area Transit Authority wishes to estimate the proportion of central city workers that use public transportation to get to work. A sample of 100 workers revealed that 64 used public transportation. Develop a 95% confidence interval for the population proportion.
Round to the fourth and write as a proportion unless otherwise stated. Problem 3 A sociologist...
Round to the fourth and write as a proportion unless
otherwise stated.
Problem 3
A sociologist randomly sampled 200 people who worked
in computer-related jobs and found that 21%
of them have changed jobs over the last six
months.
a. For a 99% confidence interval, find the margin of error for the
true proportion that changed their jobs over the last six
months.
b. Build and interpret a 99% confidence interval for the proportion
that changed their jobs over the...
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