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| modeled by a bell-shaped curve called a normal curve that is symmetric about the mean |
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| standard normal distribution |
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| normal distribution with mean 0 and standard deviation 1 |
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| the z-value for a particular x-value; is the number of standard deviations the x-value lies above or below the mean xbar |
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| normal approximation of a binomial distribution: mean and SD |
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Definition
mean: xbar=np
standard deviation: sigma=sqrt(np(1-p)) |
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| group of people or objets that you want information about |
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| members of a population can volunteer to be in the sample |
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| a rule is used to select members of a population |
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| easy-to-reach members of a population are selected |
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| each member of a population has an equal chance of being selected |
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| representative of the population you want information about |
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| sample that over- or under-represents part of the population |
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| gives a limit on how much the responses of the sample would differ from the responses of the population |
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| margin of error= plusorminus 1/sqrt(n) |
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| a group that undergoes some procedure or treatment |
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| does not undergo the procedure or treatment |
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