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Q1:
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A random sample of size 100 is taken from a population which is normally distributed with a variance of 4.
What is the standard deviation of the population?
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A. 16
B. 10
C. 4
D. 2
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Answer 1:
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Q2:
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If the sample has a mean of 32.5, calculate the 95% confidence interval for the mean of the population.
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A. (30.1, 34.9)
B. (32.1, 32.9)
C. (31.9, 33.9)
D. (32.4, 32.6)
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Answer 2:
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Q3:
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A random sample of 90 values is taken from a normal population. The following data resulted:  = 70 and Σ x2 = 505505.
Find the standard deviation of the sample.
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A. 26.77
B. 716.7
C. 711
D. 50.27
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Answer 3:
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Q4:
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What would be the equivalent z-score for a confidence level of 80%? |
A. 1.290
B. 1.280
C. 0.1554
D. 1.282
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Answer 4:
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Q5:
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Calculate upper limit of the 80% confidence interval for the mean of the sample and population in question 3.
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A. 3.618
B. 73.62
C. 66.38
D. 77.24
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Answer 5:
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