You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 70 items resulted in a sample mean of 90. The population standard deviation is o = 15. (a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.) Xto 73.10 X 66.90 (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.) 67.81 X to 72.19 x (c) What is the effect of a larger sample size on the interval estimate? OA larger sample size provides a larger margin of error. A larger sample size does not change the margin of error. O A larger sample size provides a smaller margin of error.
You may need to use the appropriate appendix table or technology to answer this question. A simple random sample of 70 items resulted in a sample mean of 90. The population standard deviation is o = 15. (a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.) Xto 73.10 X 66.90 (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.) 67.81 X to 72.19 x (c) What is the effect of a larger sample size on the interval estimate? OA larger sample size provides a larger margin of error. A larger sample size does not change the margin of error. O A larger sample size provides a smaller margin of error.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Ch 8
Transcribed Image Text:You may need to use the appropriate appendix table or technology to answer this question.
A simple random sample of 70 items resulted in a sample mean of 90. The population standard deviation is 6 = 15.
(a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.)
x to 73.10 X
66.90
(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.)
67.81
X to 72.19
x
(c) What is the effect of a larger sample size on the interval estimate?
A larger sample size provides a larger margin of error.
A larger sample size does not change the margin of error.
A larger sample size provides a smaller margin of error.
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