The formula for estimating the number of people, nn, that need to be surveyed in order to have a specified margin of error with a specified level of confidence for the average age of first kiss is given by n=z^2*stdDev^2/E^2 where z=2.266 depends on the level of confidence, stdDev is the standard deviation and E is the margin of error. How many people need to be surveyed if the standard deviation is 1.939 years and the margin of error is 0.122 years. n = (Please always round your answer up to the smallest whole number that is greater than or equal to your answer.)
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!
The formula for estimating the number of people, nn, that need to be surveyed in order to have a specified margin of error with a specified level of confidence for the average age of first kiss is given by n=z^2*stdDev^2/E^2 where z=2.266 depends on the level of confidence, stdDev is the standard deviation and E is the margin of error. How many people need to be surveyed if the standard deviation is 1.939 years and the margin of error is 0.122 years.
n = (Please always round your answer up to the smallest whole number that is greater than or equal to your answer.)
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