Question
A random sample of 100 workers in one large plant took an average of 12 minutes...
A random sample of 100 workers in one large plant took an average of 12 minutes to complete a task, with a standard deviation of 2 minutes. A random sample of 50 workers in a second large plant took an average of 11 minutes to complete the task, with a standard deviation of 3 minutes. Construct a 95% confidence interval for the difference between the two population mean completion times.
Homework Answers
Answer #1
The 95 % C I is
( 0.21202,1.7879)
Not the answer you're looking for?
Similar Questions
the employees of cybertronics, inc. need to complete a certification online. a random sample of 49...
the employees of cybertronics, inc. need to complete a
certification online. a random sample of 49 employees gives an
average time for completion of all coursework and passing the tests
of 6 hours. assume the population standard deviation is 6 hours and
the sample standard deviation is 6 hours. assume that the
population standard deviation is 6 hours and the population of
employees is fairly large. construct a 95% confidence interval for
the average time required to complete the certification.
the employees of cybertronics, inc. need to complete a certification online. a random sample of 49...
the employees of cybertronics, inc. need to complete a
certification online. a random sample of 49 employees gives an
average time for completion of all coursework and passing the tests
of 6 hours. assume the population standard deviation is 6 hours and
the population of employees is fairly large. construct a 95%
confidence interval for the average time required to complete the
certification.
A random sample of 49 teenagers from a large population was surveyed, and the average number...
A random sample of 49 teenagers from a large population was
surveyed, and the average number of movies that they had rented in
the past week was x = 1.9, with a sample standard deviation of s =
0.5.
a) Construct a 95% confidence interval for the average number of
movies rented by teenagers in a week.
b) Construct a 99% confidence interval for the average number of
movies rented by teenagers in a week.
A random sample of 49 teenagers from a large population was surveyed, and the average number...
A random sample of 49 teenagers from a large population was
surveyed, and the average number of movies that they had rented in
the past week was x = 1.9, with a sample standard deviation of s =
0.5. a) Construct a 95% confidence interval for the average number
of movies rented by teenagers in a week. b) Construct a 99%
confidence interval for the average number of movies rented by
teenagers in a week.
A random sample of 49 teenagers from a large population was surveyed, and the average number...
A random sample of 49 teenagers from a large population was
surveyed, and the average number of movies that they had rented in
the past week was x = 1.9, with a sample standard deviation of s =
0.5. a) Construct a 95% confidence interval for the average number
of movies rented by teenagers in a week. b) Construct a 99%
confidence interval for the average number of movies rented by
teenagers in a week.t v
The waiting times (in minutes) of a random sample of 20 people at a bank have...
The waiting times (in minutes) of a random sample of 20 people
at a bank have a sample standard deviation of 4.1 minutes.
Construct a confidence interval for the population variance and the
population standard deviation . Use a 90% level of confidence.
Assume the sample is from a normally distributed population.
The waiting times (in minutes) of a random sample of 2020 people at a bank have...
The waiting times (in minutes) of a random sample of
2020
people at a bank have a sample standard deviation of
4.64.6
minutes. Construct a confidence interval for the population
variance
sigma squaredσ2
and the population standard deviation
sigmaσ.
Use a
95 %95%
level of confidence. Assume the sample is from a normally
distributed population.
What is the confidence interval for the population variance
sigma squaredσ2?
(nothing,nothing)
(Round to one decimal place as needed.)
Interpret the results. Select the correct...
The waiting times (in minutes) of a random sample of 22 people at a bank have...
The waiting times (in minutes) of a random sample of 22 people
at a bank have a sample standard deviation of 4.2 minutes.
Construct a confidence interval for the population variance sigma
squaredσ2 and the population standard deviation sigmaσ. Use a 90%
level of confidence. Assume the sample is from a normally
distributed population.
The waiting times (in minutes) of a random sample of 21 people at a bank have...
The waiting times (in minutes) of a random sample of 21 people
at a bank have a sample standard deviation of 4.7 minutes.
Construct a confidence interval for the population variance σ2 and
the population standard deviation σ Use a 99%
level of confidence. Assume the sample is from a normally
distributed population.
What is the confidence interval for the population variance σ2?
(__,__) (Round to one decimal place as needed.)
What is the confidence interval for the population standard
deviation σ?...
In a random sample of 8 people, the mean commute time to work was 35.5 minutes...
In a random sample of 8 people, the mean commute time to work
was 35.5 minutes and the standard deviation was 7.2 minutes. A 95%
confidence interval using the t-distribution was calculated to be
left parenthesis 29.5 comma 41.5 right parenthesis. After
researching commute times to work, it was found that the
population standard deviation is 9.2 minutes. Find the margin of
error and construct a 95% confidence interval using the standard
normal distribution with the appropriate calculations for a...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 21 minutes ago
asked 22 minutes ago
asked 22 minutes ago
asked 34 minutes ago
asked 35 minutes ago
asked 54 minutes ago
asked 58 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago