Question

A high school wanted to teach students about the effects of driving while under the influence. A police officer allowed students to wear special goggles that simulated the effects of driving while impaired. A random sample of eight students was selected. The reaction time it took for each student to stop from a speed of 55 mph was recorded while the student was not wearing the goggles (unimpaired) and then again while wearing the goggles (impaired). Construct a 95% confidence interval. Round answers to two decimal places.

Participant

Unimpaired

Impaired

Difference

1	4.36	5.73	1.37
2	5.01	4.57	-0.44
3	4.14	5.54	1.4
4	4.62	5.53	0.91
5	4.56	5.23	0.67
6	4.17	5.78	1.61
7	4.54	5.1	0.56
8	4.7	5.47	0.77
Mean	4.51	5.37	0.86
SD	0.29	0.40	0.65

What is the lower bound of the 95% CI?

What is the upper bound of the 95% CI?

Answer 1