Automobile manufacturers are interested in the

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19. Automobile manufacturers are interested in the difference in reaction times for drivers reacting to tradi- tional incandescent lights and to LED lights. A sample of 22 drivers are told to press a button as soon as they see a light flash in front of them and the reaction time was measured in milliseconds. Each driver was shown each type of light. The average difference in reaction times (traditional - LED) is 4.5 ms with a standard deviation of 5.79 ms. A 95% confidence interval for The average difference between the two reaction times was (1.93, 7.07). Which of the following is the best interpretation? Page 8 of 18
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