Question 1
Sample with size n = 100 has mean = 30.
Assuming the population standard deviation is 8,
construct 95% confidence interval for population mean.
Use formula on page 312, z?/2 = 1.96
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between 28.4 and 31.6 |
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between 27.0 and 33.0 |
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between 26.1 and 34.2 |
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between 24.1 and 35.9 |
1 points
Question 2
With sample mean x = 12.5, sample size n = 40
and population standard deviation = 4
find 99% confidence interval for population mean.
Use formula on page 312 with z?/2 = 2.575
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between 11.5 and 13.5 |
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between 10.9 and 14.1 |
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between 10.1 and 15.1 |
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between 7.4 and 14.2 |
1 points
Question 3
Use Appendix Table IV to find t0.10 for sample size n
= 16.
Remember, df in the table is: df = n ? 1
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2.015 |
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1.860 |
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1.725 |
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1.341 |
1 points
Question 4
For sample mean x = 150, sample size n = 36
and sample standard deviation s = 40
find 80% confidence interval for population mean.
Population standard deviation is not known,
you should use formula on page 328 with t-value
from Appendix Table IV (use column t0.10).
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135.6 to 148.4 |
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154.2 to 175.8 |
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141.3 to 158.7 |
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162.3 to 187.5 |
1 points
Question 5
Use example posted in this week Lectures section
to estimate Population Proportion.
Sample proportion is ps = 0.48, sample size 125,
zc = 1.96 (90% confidence level).
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0.26 to 0.64 |
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0.39 to 0.57 |
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0.41 to 0.52 |
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0.28 to 0.71 |
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