Question
A simple random sample of 40 items resulted in a sample mean of 30. The population...
A simple random sample of 40 items resulted in a sample mean of 30. The population standard deviation is σ = 20. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. Assume that the same sample mean was obtained from a sample of 100 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places. What is the effect of a larger sample size on the interval estimate? larger or smaller
Homework Answers
Answer #1
Here
sample mean 
population standard deviation σ = 20
and sample size 
a 95% confidence interval for the population mean
When n = 100,
a 95% confidence interval for the population mean
So, for larger sample size, width of the confidence interval gets smaller.
Not the answer you're looking for?
Similar Questions
A simple random sample of 70 items resulted in a sample mean of 80. The population standard deviation is
A simple random sample of 70 items resulted in a sample mean of
80. The population standard deviation isσ = 15.(a)Compute the 95% confidence interval for the population mean.
(Round your answers to two decimal places.)to(b)Assume that the same sample mean was obtained from a sample of
140 items. Provide a 95% confidence interval for the population
mean. (Round your answers to two decimal places.)to(c)What is the effect of a larger sample size on the interval
estimate?A larger sample size...
{Exercise 8.3 (Algorithmic)} A simple random sample of 40 items resulted in a sample mean of...
{Exercise 8.3
(Algorithmic)}
A simple random sample
of 40 items resulted in a sample mean of 30. The population
standard deviation is σ = 15.
a.
Compute the 95% confidence interval for the population mean. Round
your answers to one decimal place.
Enter your answer using parentheses and a comma, in the form
(n1,n2). Do not use commas in your numerical answer (i.e. use 1200
instead of 1,200, etc.)
b.
Assume that the same sample mean was obtained from a...
A simple random sample of 60 items resulted in a sample mean of 91. The population...
A simple random sample of 60 items resulted in a sample mean of
91. The population standard deviation is 12. a. Compute the 95%
confidence interval for the population mean (to 1 decimal). ( , )
b. Assume that the same sample mean was obtained from a sample of
120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals). ( , ) c. What is the effect of a larger
sample size on the margin of...
A simple random sample of 60 items resulted in a sample mean of 79. The population...
A simple random sample of 60 items resulted in a sample mean of
79. The population standard deviation is 13. a. Compute the 95%
confidence interval for the population mean (to 1 decimal). b.
Assume that the same sample mean was obtained from a sample of 120
items. Provide a 95% confidence interval for the population mean
(to 2 decimals). c. What is the effect of a larger sample size on
the margin of error?
A simple random sample of 60 items resulted in a sample mean of 71. The population...
A simple random sample of 60 items resulted in a sample mean of
71. The population standard deviation is 14. a. Compute the 95%
confidence interval for the population mean (to 1 decimal). b.
Assume that the same sample mean was obtained from a sample of 120
items. Provide a 95% confidence interval for the population mean
(to 2 decimals). c. What is the effect of a larger sample size on
the margin of error?
A simple random sample of 60 items resulted in a sample mean of 71. The population...
A simple random sample of 60 items resulted in a sample mean of
71. The population standard deviation is 13.
a. Compute the 95% confidence interval for the population mean
(to 1 decimal). ( , )
b. Assume that the same sample mean was obtained from a sample
of 120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals). ( , )
c. What is the effect of a larger sample size on the margin of...
A simple random sample of 60 items resulted in a sample mean of 81. The population...
A simple random sample of 60 items resulted in a sample mean of
81. The population standard deviation is 17.
a. Compute the 95% confidence interval for the population mean
(to 1 decimal).
( , )
b. Assume that the same sample mean was obtained from a sample
of 120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals).
( , )
c. What is the effect of a larger sample size on the margin of
error?
A simple random sample of 60 items resulted in a sample mean of 89. The population...
A simple random sample of 60 items resulted in a sample mean of
89. The population standard deviation is 18.
a. Compute the 95% confidence interval for the population
mean
b. Assume that the same sample mean was obtained from a sample
of 120 items. Provide a 95% confidence interval for the population
mean
c. What is the effect of a larger sample size on the margin of
error?
-increase - decrease -same - cannot determine
A simple random sample of 60 items resulted in a sample mean of 77. The population...
A simple random sample of 60 items resulted in a sample mean of
77. The population standard deviation is 17.
a. Compute the 95% confidence interval for the population mean
(to 1 decimal).
( , )
b. Assume that the same sample mean was obtained from a sample
of 120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals).
( , )
A simple random sample of 60 items resulted in a sample mean of 89. The population...
A simple random sample of 60 items resulted in a sample mean of
89. The population standard deviation is 12.
a. Compute the 95% confidence interval for the population mean
(to 1 decimal).
b. Assume that the same sample mean was obtained from a sample
of 120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals).
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 1 minute ago
asked 8 minutes ago
asked 29 minutes ago
asked 43 minutes ago
asked 43 minutes ago
asked 55 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 2 hours ago