How long does it take to fly from Denver to Atlanta on Delta Airlines? The table below shows 56 observations on flight times (in minutes) for the first week of March 2005 (a) Use the grouped data formula to estimate the mean and standard deviation. (b) Using the ungrouped data (not shown). The ungrouped sample mean is 161.63 minutes and the ungrouped standard deviation is 8.07 minutes. How close did your grouped estimates come? (c) Why might flight times not be uniformly distributed within the second and third class intervals? (Source : www.bts.gov.)
Flight Times DEN to ATL (minutes) | |||
From |
| To | frequency |
140 | < | 150 | 1 |
150 | < | 160 | 25 |
160 | < | 170 | 24 |
170 | < | 180 | 4 |
180 | < | 190 | 2 |
| Total |
|
|
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