Question
A random sample is drawn from a population having σ = 15. a. If the sample...
A random sample is drawn from a population having σ = 15.
a. If the sample size is n = 30 and the sample mean x = 100, what is the 95% confidence interval estimate of the population mean µ?
b. If the sample size is n = 120 and the sample mean x = 100, what is the 95% confidence interval estimate of the population mean µ?
c. If the sample size is n = 480 and the sample mean x = 100, what is the 95% confidence interval estimate of the population mean µ?
Homework Answers
Answer #1
Here 
population standard deviation is known
So, we can use the Z-tables
at 95% confidence 
a) Here n = 30
The 95% confidence interval for mean is 
b) Here n = 120
The 95% confidence interval for mean is
c) Here n = 480
The 95% confidence interval for mean is
Not the answer you're looking for?
Similar Questions
A simple random sample of size n=15 is drawn from a population that is normally distributed....
A simple random sample of size n=15 is drawn from a population
that is normally distributed. The sample mean is found to be x
overbar=62 and the sample standard deviation is found to be s=19.
Construct a 95% confidence interval about the population mean.
The 95% confidence interval is (_,_).
(Round to two decimal places as needed.)
A simple random sample of size n =19 is drawn from a population that is normally...
A simple random sample of size n =19 is drawn from a population
that is normally distributed with σ=16. The sample mean is found to
be x overbar = 65. Construct a 95% confidence interval about the
population mean.
Suppose we know that the population standard deviation for wages (σ) is $15. A random sample...
Suppose we know that the population standard deviation for wages
(σ) is $15. A random sample of n = 900 results in a sample mean
wage of $50. (10 points)
Provide 95% confidence interval estimate of µ. Interpret the
result. What is the value of the margin of error?
Provide 90% confidence interval estimate of µ. What is the value
of the margin of error?
Provide 99% confidence interval estimate of µ. What is the value
of the margin of...
A random sample of 125 items is drawn from a population whose standard deviation is known...
A random sample of 125 items is drawn from a population whose
standard deviation is known to be σ = 30. The sample mean
is x¯ = 860.
(a)
Construct an interval estimate for μ with 95 percent
confidence. (Round your answers to 1 decimal
place.)
The 95% confidence interval is from _________ to
__________
(b)
Construct an interval estimate for μ with 95 percent
confidence, assuming that σ = 60. (Round your answers to 1
decimal place.)
The 95% confidence...
A simple random sample of size n is drawn from a population that is known to...
A simple random sample of size n is drawn from a population that
is known to be normally distributed. The sample variance is
determined to be 20.
a) Construct a 95% confidence interval for σ² if the sample size
is 40.
b) How does increasing the level of confidence affect the width
of the confidence interval?
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that
is normally distributed. The sample mean, x overbar, is found to
be 109, and the sample standard deviation, s, is found to be
10.
(a) Construct a 95% confidence interval about mu if the
sample size, n, is 18.
(b) Construct a 95% confidence interval about mu if the
sample size, n, is 14.
(c) Construct a 90% confidence interval about mu if the
sample size, n,...
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that
is normally distributed. The sample mean, x overbar, is found to
be 105, and the sample standard deviation, s, is found to be 10.
(a) Construct a 95% confidence interval about mu if the sample
size, n, is 26. (b) Construct a 95% confidence interval about mu
if the sample size, n, is 20. (c) Construct an 80% confidence
interval about mu if the sample size, n,...
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that
is normally distributed. The sample mean, x overbar, is found to
be 113, and the sample standard deviation, s, is found to be
10.
(a) Construct a 95% confidence interval about mu if the
sample size, n, is 24.
(b) Construct a 95% confidence interval about mu if the
sample size, n, is 17.
(c) Construct a 70% confidence interval about mu if the
sample size, n,...
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that
is normally distributed. The sample? mean, is found to be 112?, and
the sample standard? deviation, s, is found to be 10.
?(a) Construct a 95?% confidence interval about
mu? if the sample? size, n, is 18.
?(b) Construct a 95?% confidence interval about
mu? if the sample? size, n, is 11.
?(c) Construct a 70?% confidence interval about
mu? if the sample? size, n, is 18....
Let a random sample be taken of size n = 100 from a population with a...
Let a random sample be taken of size n = 100 from a population
with a known standard deviation of \sigma σ = 20. Suppose that the
mean of the sample is X-Bar.png= 37. Find the 95% confidence
interval for the mean, \mu μ , of the population from which the
sample was drawn. (Answer in CI format and round the values
to whole numbers.)
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 5 minutes ago
asked 9 minutes ago
asked 19 minutes ago
asked 29 minutes ago
asked 40 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago