question archive Listed below are speeds (mi/h) measured from traffic on a busy highway
Listed below are speeds (mi/h) measured from traffic on a busy highway
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Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct aa 90% confidence interval estimate of the population standard deviation.
| 63 | 64 | 64 | 56 | 64 | 53 | 59 | 58 | 59 | 69 | 60 | 68 |
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The confidence interval estimate is ? mi/h < σ < ? mi/h.
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Answer:
|
Confidence Interval Estimate for the Mean |
|
|
Data |
|
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Sample Standard Deviation |
4.756972554 |
|
Sample Mean |
61.41666667 |
|
Sample Size |
12 |
|
Confidence Level |
90% |
|
Intermediate Calculations |
|
|
Standard Error of the Mean |
1.373219692 |
|
Degrees of Freedom |
11 |
|
t Value |
1.7959 |
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Interval Half Width |
2.4661 |
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|
|
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Confidence Interval |
|
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Interval Lower Limit |
58.95 |
|
Interval Upper Limit |
63.88 |
