some statistics problem (3)..please everyone help me
3.
Despite it being illegal to drive a car whilst using a mobile phone, many drivers can still be seen flouting the law on our roads.
Are reaction times impaired if the driver is engrossed in conversation on a mobile phone, or have the drivers heightened awareness making them able to cope with the unexpected?
A random sample of drivers agreed to take part in an experiment where their reaction times were measured while driving with and without the use of a mobile phone.
Their reaction times (in milliseconds) are shown below.
Table:
Driver 1 2 3 4 5 6 7 8 9 10 11 12
Without 604 556 540 522 459 554 513 470 556 531 599 537
Mobile
With Mobile 636 623 615 672 601 600 542 554 543 520 609 559
Driver 13 14 15 16 17 18 19 20 21 22 23 24
Without 619 536 554 467 525 508 529 470 512 487 515 499
Mobile
With 595 565 573 554 626 501 574 468 578 560 525 647
Mobile
Driver 25 26 27 28 29 30 31 32
Without 448 558 589 814 519 462 521 543
Mobile
With 456 688 679 960 558 482 527 536
Mobile
