You make a distance measurement of 7.62341 m and compute the uncertainty of that measurement to be 0.29639 m. Write this result in the most appropriate form.

Question 1

	7.62341 0.29639 m
	7.62 0.30 m
	7.6 0.2 m
	None of the above

Question 2

You hypothesize that changes in red lights take less !me to be perceived by the human visual system than changes in purple lights. To test this, you measure human reaction times to changes in each color, and obtain the following results:

• Average reaction time to changes in red light: 0.58 0.02 s
• Average reaction time to changes in purple light: 0.63 0.03 s

Are the two reaction times "significantly different"?

Question 2 options:

	Yes
	No
	Correct answer cannot be determined with the information given

Question 3

Given the data in the previous question, what conclusion can you draw?

Question 3 options:

	The data support the hypothesis. The human visual system does appear to react faster to red light.
	The data do not support the hypothesis, but do not contradict it. One cannot conclude on the basis of this data that there is an effect.
	The data show that there is definitely no effect of color on reaction time.

Question 4

Let's say you do your experiment to measure reaction times and measure a reaction time of t = 2.21.0 s. Estimate the value and uncertainty of the reciprocal of the reaction time f = 1/t .

I just need to understand well.