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Confidence Intervals Flashcards | StudBud
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Confidence Intervals
Confidence Intervals
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A review game for Probability and Statistics
Flashcards
9 cards
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Questions
9
Answers
1
What makes the Margin of Error wider?
smaller sample size
smaller standard deviation
lower confidence
higher sample size
2
Find the 82% C.I. : n=40, sigma=10, x-bar=92
(90.703, 93.297)
(90.553, 93.447)
(89.88, 94.12)
(90.561, 93.439)
3
What sample size is needed for a ME within +/- 20%, to estimate a proportion at 99% Confidence ?
41
7
42
40
4
What is the margin of error for a 80% C.I. when sigma=10 and there is a sample size of 40 ?
0.320
1.331
1.265
2.026
5
What is the margin of error for a 95% C.I. when s=20 and there is a sample size of 30 ?
7.468
7.595
7.157
1.96
6
What sample size is needed for a margin of error within +/- 0.5, with sigma = 2 and 90% C.I. ?
7
43
44
45
7
What is the best unbiased estimator of Mu?
Mode
Median
standard deviation
x-bar
8
When must you use s instead of sigma?
if sigma is unknown
if n is small
If n is less than 30
if n is greater than 30
9
If you increase the sample size, the confidence interval gets
narrower
more accurate
less precise
wider
