is auditing Star International Airways, which flies numerous charters. The Titan contract specifies that the average fl
The Accountability Office is auditing Star International Airways, which flies numerous charters. The Titan contract specifies that the average flight may be no more than 15 minutes late. A sample of 20 flights reveals the results below:
|
Flights and Their Delay Status |
|
|
Flight Number |
Status |
|
217 |
On time |
|
167 |
20 minutes late |
|
133 |
17 minutes late |
|
207 |
64 minutes late |
|
219 |
On time |
|
457 |
96 minutes late |
|
371 |
30 minutes late |
|
612 |
On time |
|
319 |
6 minutes late |
|
423 |
12 minutes late |
|
684 |
11 minutes late |
|
661 |
61 minutes late |
|
511 |
On time |
|
536 |
On time |
|
493 |
17 minutes late |
|
382 |
12 minutes late |
|
115 |
6 minutes late |
|
107 |
3 minutes late |
|
19 |
26 minutes late |
|
123 |
19 minutes late |
The newly hired junior analyst, Bob, is requested to write a memo interpreting this information. Bob finds that he needs a good grasp of statistical inference to write the memo. He researches statistical inference and develops the following list of topics:
- sampling bias
- sampling error
- random sample
- central limit theorem
- sampling distribution of sample means
- normal curve
- Z score
- probability
Find and explain each. Then discuss why each is necessary for Bob to understand as he interprets the information.
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