Time (sec) until the light flashes
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The image shows a rectangular shape on a timeline graph. The x-axis represents "Time (sec) until the light flashes" from 0 to 5 seconds, and there's a light green/mint colored rectangle spanning from approximately 1 second to 4 seconds on the timeline. Show more…
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Question 1: Imagine an experiment where a person is seated in front of a computer. When a certain signal flashes on the screen, the subject presses a key on the keyboard as quickly as possible. A clock measures the amount of time that elapses between the signal's appearance and the subject's keypress. This amount of time is known as the reaction time. Different subjects take different amounts of time to react to the signal. Based on research, the experimenter believes that the reaction times have a normal distribution with μ = 200 milliseconds and σ = 25 milliseconds. C) Suppose a sample of 9 research participants is collected. Find the probability that the sample average will be less than 196. D) Suppose a sample of 36 research participants is collected. Find the probability that the sample average will be between 206 and 210 milliseconds.
Lakshya H.
25th and 80th percentile
Wei Z.
On each trial of an experiment, a subject is presented with a constant soft noise, which is interrupted at some unpredictable time by a noticeably louder sound. The time it takes for the subject to react to this louder sound is recorded. The following list contains the reaction times (in milliseconds) for the 17 trials of this experiment: 152, 229, 241, 202, 285, 311, 231, 217, 193, 269, 212, 236, 226, 171, 296, 235, 261 Find 25th and 80th percentiles for these reaction times. (If necessary, consult a list of formulas.) (a) The 25th percentile: milliseconds (b) The 80th percentile: milliseconds
Joshua A.
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