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Duplicate of Confidence Intervals Flashcards | StudBud
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Duplicate of Confidence Intervals
Duplicate of Confidence Intervals
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A review game for Probability and Statistics
Flashcards
9 cards
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Practice quiz
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Questions
9
Answers
1
What is the margin of error for a 95% C.I. when sigma=20 and there is a sample size of 30 ?
7.157
6.006
1.307
3.469
2
What makes the Margin of Error wider?
lower confidence
smaller standard deviation
smaller sample size
higher sample size
3
what is the best unbiased estimator of Mu?
standard deviation
Median
x-bar
Mode
4
What sample size is needed for a margin of error within +/- .5, with sigma = 2 and 90% C.I. ?
43
14
44
7
5
When can you use s instead of sigma?
if n is small
If n is less than 30
if n is greater than 30
if sigma is unknown
6
What is the margin of error for a 80% C.I. when sigma=10 and there is a sample size of 40 ?
1.265
2.026
0.320
1.331
7
What sample size is needed for a margin of error within +/- 2, with sigma = 5 and 99% C.I. ?
2
62
42
41
8
If you increase the sample size, the confidence interval gets
wider
less precise
narrower
more accurate
9
Find the 82% C.I. : n=40, sigma=10, x-bar=92
(90.553, 93.447)
(90.561, 93.439)
(90.703, 93.297)
(89.88, 94.12)
