Question
In: Math
A simple random sample of 60 items resulted in a sample mean of 70. The population...
A simple random sample of 60 items resulted in a sample mean of 70. The population standard deviation is = 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 sample of 130 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places.
c. What is the effect of a larger sample size on the interval estimate?
Larger sample provides a - Larger or smaller - margin of error?
Solutions
milcah answered 6 months agoRelated Solutions
A simple random sample of 70 items resulted in a sample mean of 60. The population...
A simple random sample of 70 items resulted in a sample mean of
60. The population standard deviation is σ = 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...
A simple random sample of 70 items resulted in a sample mean of 90. The population...
A simple random sample of 70 items resulted in a sample mean of
90. The population standard deviation is
σ = 15.
A. Compute the 95% confidence interval for the population mean.
(Round your answers to two decimal places.)
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.)
A simple random sample of 70 items resulted in a sample mean of 90. The population...
A simple random sample of 70 items resulted in a sample mean of
90. The population standard deviation is
σ = 5.
(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...
A simple random sample of 60 items resulted in a sample mean of 80. The population...
A simple random sample of 60 items resulted in a sample mean of
80. The population standard deviation is
σ = 5.
(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
120 items. Provide a 95% confidence interval for the population
mean. (Round your answers to two decimal places.)
to
A simple random sample of 60 items resulted in a sample mean of 80. The population...
A simple random sample of 60 items resulted in a sample mean of
80. The population standard deviation is
σ = 5.
(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
120 items. Provide a 95% confidence interval for the population
mean. (Round your answers to two decimal places.)
to
A simple random sample of 60 items resulted in a sample mean of 65. The population...
A simple random sample of 60 items resulted in a sample mean of
65. The population standard deviation is 16. 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 65. The population...
A simple random sample of 60 items resulted in a sample mean of
65. The population standard deviation is 16. 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 95. The population...
A simple random sample of 60 items resulted in a sample mean of
95. 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?
SelectIt increasesIt decreasesIt...
A simple random sample of 60 items resulted in a sample mean of 10. The population...
A simple random sample of 60 items resulted in a sample mean of
10. The population standard deviation is 20.
Compute the 95% confidence interval for the population mean.
Round to 1 decimal place.
Assume that the same sample mean was obtained from a sample of
120 items. Provide a 95% confidence interval for the population
mean. Round to 2 decimal places.
What is the effect of a larger sample size on the interval
estimate? Larger sample provides a larger...
A simple random sample of 60 items resulted in a sample mean of 63. The population...
A simple random sample of 60 items resulted in a sample mean of
63. 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).
( , )
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