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Q1:
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What sample size is needed to estimate the mean of a population( with 90% confidence) to within 0.8 seconds for a population with a standard deviation of 7 seconds? |
A. 15
B. 208
C. 205
D. 210
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Answer 1:
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Q2:
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What would be the equivalent z-score for a confidence level of 88%? |
A. 1.555
B. 0.1700
C. 1.700
D. 1.55
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Answer 2:
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Q3:
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An opinion poll is to be conducted using a random sample of 1000 people. Using a value of p of 0.5 and a level of confidence of 95%, what would be the margin of error? |
A. 1%
B. 2%
C. 3%
D. 4%
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Answer 3:
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Q4:
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It is known that about 20% of cricketers bat left handed. What size of sample is needed to be taken so that the sample proportion is within 3% of the true value? (at a 95% level of confidence) |
A. 684
B. 11
C. 121
D. 546
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Answer 4:
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Q5:
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An opinion poll with a level of confidence of 95% and an estimated value of p of 0.5 has a margin of error of 4%.
How many people would have taken part in the poll?
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A. 151
B. 301
C. 1202
D. 601
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Answer 5:
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