algebra 2 topic test 2 vocabulary
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random sample
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all members of the population are equally likely to be chosen
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normal distribution
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has data that vary randomly from the mean
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percentiles
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the value below which a percentage of data falls
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measures of variation
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describes how the data in a data set are spread out
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sample
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a part of a population
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outlier
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a number that is very far from the other numbers in the set
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median
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the middle number in an ordered set of numbers
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standard deviation
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measures showing how much data values deviate from the mean
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margin of error
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helps you find the interval in which the mean of the population is likely to be, it's based on the size of the sample and the confidence level desired
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conditional probability
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the probability of an event B in relationship to an event A is the probability that even B occurs given that event A has already occurred
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z score
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the number of standard deviations that a value, x, is above or below the mean
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binomial experiment
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experiment that has a fixed number of trials, each trial is independent of the others, only two outcomes, and probability of each outcome remains constant from trial to trial
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measures of central tendency
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the mean, median, mode, and standard deviation of a set of data
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standard normal curve
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a "bell-shaped" curve for standard normal distribution
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mean
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the sum of the values in the set divided by the number of items in the set
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range of a data set
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the difference between the highest and lowest values in the set
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mode
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the value or values that occur most often in a set
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confidence level
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the percentage of all possible samples that can be expected to include the true population parameter
