For a certain survey, software reports the results shown below for responses on the number of times a week the subject reads a newspaper. Complete parts a through d. Variable N 69 Std Dev 2.9 95.0% CI (3.704,5.096) News Mean 4.4 SE Mean 0.349 a. Is it plausible that μ = 7, where μ is the population mean for all respondents? Explain. A. No, because 7 is well outside the 95% confidence interval given in the software results. OB. No, because 7 is within the 95% confidence interval given in the software results. OC. Yes, because 7 is within the 95% confidence interval given in the software results. O D. Yes, because 7 is well outside the 95% confidence interval given in the software results. b. Suppose that the sample size had been 240, with x=4.4 and s= 2.9. Use technology to find a 95% confidence interval. Describe the effect of sample size on the margin of error. The 95% confidence interval is (4.0, 4.8). (Round to one decimal place as needed.) Compare the confidence interval found in the previous step to the one reported. What effect does sample size have on the margin of error? OA. As sample size increases, the margin of error becomes smaller. OB. As sample size increases, the margin of error does not change. OC. As sample size increases, the margin of error becomes larger.
For a certain survey, software reports the results shown below for responses on the number of times a week the subject reads a newspaper. Complete parts a through d. Variable N 69 Std Dev 2.9 95.0% CI (3.704,5.096) News Mean 4.4 SE Mean 0.349 a. Is it plausible that μ = 7, where μ is the population mean for all respondents? Explain. A. No, because 7 is well outside the 95% confidence interval given in the software results. OB. No, because 7 is within the 95% confidence interval given in the software results. OC. Yes, because 7 is within the 95% confidence interval given in the software results. O D. Yes, because 7 is well outside the 95% confidence interval given in the software results. b. Suppose that the sample size had been 240, with x=4.4 and s= 2.9. Use technology to find a 95% confidence interval. Describe the effect of sample size on the margin of error. The 95% confidence interval is (4.0, 4.8). (Round to one decimal place as needed.) Compare the confidence interval found in the previous step to the one reported. What effect does sample size have on the margin of error? OA. As sample size increases, the margin of error becomes smaller. OB. As sample size increases, the margin of error does not change. OC. As sample size increases, the margin of error becomes larger.
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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Transcribed Image Text:For a certain survey, software reports the results shown below for responses on the number of times a week the subject reads a newspaper. Complete parts a through d.
N
69
95.0% CI
(3.704,5.096)
Variable
News
Mean
4.4
Std Dev
2.9
SE Mean
0.349
a. Is it plausible that µ = 7, where μ is the population mean for all respondents? Explain.
A. No, because 7 is well outside the 95% confidence interval given in the software results.
B. No, because 7 is within the 95% confidence interval given in the software results.
Yes, because 7 is within the 95% confidence interval given in the software results.
D. Yes, because 7 is well outside the 95% confidence interval given in the software results.
b. Suppose that the sample size had been 240, with x = 4.4 and s= 2.9. Use technology to find a 95% confidence interval. Describe the effect of sample size on the margin of error.
The 95% confidence interval is (4.0, 4.8).
(Round to one decimal place as needed.)
Compare the confidence interval found in the previous step to the one reported. What effect does sample size have on the margin of error?
A. As sample size increases, the margin of error becomes smaller.
B. As sample size increases, the margin of error does not change.
C. As sample size increases, the margin of error becomes larger.
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