Suppose you compare the reaction time of you dominant hand to your friend's. Yours is 0.150 s, and his is 0.200 s. Which of the following represents the percent difference between your reaction times? N.B. you don't need to keep track of any minus signs in your answer: these are magnitudes, meaning an absolute value has been taken. 75% 133% 28.6% 33.3% 25%
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
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